It does seem fishy, it's his only post, and Avast! is hardly a reputable anti-virus.
Heretic!
So I haven't had a chance to look at this yet, but it does seem like a very useful tool to me, as a server admin, if it can automatically re-name maps as kf-mapname-blacklist, or move them to another folder as they become outdated. It would save me complaints of perks not working right after an update.
EDIT: one potential problem though, the mapname in the whitelist thread doesn't always match the filename of the whitelisted maps, I've noticed... wouldn't want false positives.
What would be REALLY nice is if tripwire just updated the client to flag maps in the map selection screen for whitelist/non-whitelist status when people are voting.