kbm, you either lie or just don't understand technical details: pruning ring signatures do not affect any mixin's or anonymity, this make help you to understand why (if really you want):
Kbm really isn't a lying kind of guy. He's an XMR supporter yes but not a mindless shill or troll. I'm sure he just misunderstood on this point, and if he has questions about I would be happy to help him understand. Zoidberg is correct on this point.