Firstly - if someone can translate that page into German for me, very handy... and interesting new doc from USK. Hadn't seen it (and I don't speak anything like enough German). I hope they do a translation for it!
Ok, I've done a quick translation (see the file I've hopefully managed to attach). I've tried to stay as close to your text as possible, even if the resulting German is not up to literary standards as a result

. Note that I've used the formal "Sie" for "you", even if many German publishers seem to think it's more hip to use the informal "Du". Also, perhaps some of the other German speakers on this forum could have I quick look to see if I mangled something up badly.
Realistic environment + realistic people + WWII + dismemberment = too much in one go. We'll be submitting (on the advise of the German distributor) without dismemberment. But what does that new USK doc say about it?
Since the document is longish and written in the kind of pseudo-intellectual gibberish I detest, I'm just going to skim the thing and translate what I think are the most relevant points.
The first part of the document defines the basis why they are rating games in the first place (to determine its "Wirkungsmacht", i.e. the strength of its impact, and how damaging it is to teenagers).
Page 12, bottom: "Further relevant factors are the challenges and missions within the game: in which way can game objectives be reached ? Are there non-violent solutions ? If objectives can be reached non-violently (for instance through sneaking, communication or stealthy infiltration), this can be taken into perspective in terms of its sphere of influence of a game. Furthermore, it should be determined how the actual goal of the game and individual objectives during the game are set, for instance it is important which role the player takes when controlling his avatar: is it the side of good or evil, are the sides mixed, are actions required that are considered criminal in real life or can/must the player control his avatar in a way that uninvolved bystanders are attacked without consequences ?"
(Sorry for the horrible translation, but the German doesn't make much more sense either).
Page 16, bottom: "4.9 Violence
For the rating the context (in time and space) and the type of violence according to the genre must be taken into account, as well as the determination if - and if, through what - violence seems the only way for conflict solving. Also considered should be a possible medial giving of meaning of violent content, for example due to identified problematization, trivialization or idealization. "
(No, I have no clue what they're talking about either).
Page 17, top: "For assessing the effect of the power of violence the visualization and primarily hit the visualization plays a central role. This can be implemented in a variety of graphic styles, from comic-like abstract to highly realistic. Are the results of violence implemented in detail and include the display of blood and the results of injury (for example wounds, burns, acoustic indication of bones breaking, etc.) or even the possibility to dismember enemies or similar drastic visualization, then this is of heightened importance when determining impairment or even endangerment."
Page 17 bottom and 18, top: "The more realistic the political conflict, the weapons used, the acoustic implementation or the identifiably as people of the actors, the more readily impairments or even endangerments have to be assumed. Also, a direkt connection to a current or historic real war scenario which is implemented in a realistic audiovisual way (e.g. in a first person shooter with very direct connection to the action) is to be taken into account for the rating. This is especially important if there is a tight battle atmosphere or a high degree of immersion."
The remaining points address a sense of dread in games targeted specifically at children, sexual content, discrimination, excessive vulgarity and drug use, which I assume are irrelevant for RO2.
Bottom line:
Realistic environment + realistic people + WWII + dismemberment = too much in one go.
seems spot on, and the document itself doesn't really give you any more concrete reference points on what needs to be cut and what can stay in - it's basically at the discretion of whoever rates the game and how he/she interprets the 20 pages of gibberish.
I guess I'll buy the game via Amazon in the UK - I can live without seeing people blown into pieces by grenades, but I do want to see if and where I hit someone, and I wouldn't be surprised if you have to cut/nerf that too.
P.S.: Regarding you FAQ, as far as I know, if you buy goods by mail order within the EU, the sales tax of the buyer's country is collected and forwarded to the respective government by the merchant, so "voting with your wallet" is only possible when buying from outside the EU (and then avoiding customs).