[...]
Now you have these guys like Adam Back and Coblee making nonsensical comments claiming that bitcoin is proof of stake and mining doesn't even matter. [...]
I really don't understand your interpretation of those tweets: they are not talking about PoS.
Instead of admitting bitcoin failed because it's designed to centralize, they claim control of the protocol rests with nodes and whatever miners do doesn't matter, aka proof of stake - except nodes can be sybiled so what they're saying makes zero sense. They're advocating a completely nonsensical explanation of how they think bitcoin should work instead of just admitting it failed.