That block was mined by Antpool, not p2pool. Looks like the pool is falsely reporting a block found or the pool is mining in antpool and not p2pool and it found a block for antpool. If the latter is the case and your not the pool's owner then you've been scammed.
Any verifiable nodes? Where to go? Nobody seems to care that it is impossible to find this fork if you weren't already following this thread. The info on the main page is outdated. The links are for pages that don't have current info. How is the hashrate gonna increase if it's not readily accessible to anyone? I'm gonna make my own node again, but not everyone can do it