Russians had access to k98s, g43s, stg44s, mp40s, stielhandgranates, panzers, tellermines, panzerschreks, etc.
Germans had access to PPShs, SVT40s, M38s, M44s, T34s, etc.
That doesn't mean absolutely anything the Russians didn't have Panzerfausts in numbers big enough to be included in the game- they were just found here and there and they used them sporadically, as did Germans with Russian weapons.
The fact that the Russians have a stupid amount of Panzerfausts available(Germans too) is just there to make it widely known that the dev team is biased towards the soviets. The soviets suffered greatly from limited anti-tank capability, yet in this game they're equipped with the best german weaponry... oh my.
Soviets shouldn't get access to Panzerfausts, period. If they capture a German ammo storage then they get access to about 5 of them before they stop spawning, and Germans only get fausts for Pak-soldats, along with a ~100 sec spawning faust in the base.
The bias boggles my mind.