The primary set of objections appears to be centered around how Bitcoin can’t operate at the scale of monetary systems (tens of thousands of transactions per second). Secondarily, that crypto assets aren’t backed by anything (aren’t a claim on other wealth).
Both valid constraints.
But these aren’t the reasons that crypto assets, Bitcoin and DeFi are interesting!
If he’d come out with some superior theoretical foundation for trust-free Byzantine fault tolerant distributed ledger technology obsoleting the current state of the art, maybe this would be interesting. But it doesn’t appear he even understands why this invention is interesting…. Or, maybe if he argued that total-order consensus isn’t required to maintain consistency in distributed state machines and hence PoW is unnecessary, it might be useful commentary — but nope…
Nothing new here. Move along.