i don't understand how Adam Back trying to distance himself away from Blockstream cheats F2Pool, or as any bearing on the consensus.
I can't speak for F2Pool, and don't even know if that announcement is genuine, but it's not so hard to think of why it might matter. For example, assume you're F2Pool and think the consensus agreement is a compromise you're not particularly keen on. You agree anyway since it's better to at least get something done and to mend some bridges between the confliciting sides. Then you find out that actually one of the sides doesn't endorse the consensus at all, so you're agreeing to a compromise you don't like for no good reason at all.