Pretty much all cryptos are heavily centralized. He mentioned the Eth Dao hack and subsequent fork. I agree that disqualifies Ethereum from being classified as decentralized. Again, I’m not here to defend anything outside of bitcoin.
He says bitcoin miner concentration means miners control bitcoin. That was disproven when the UASF happened. Users/nodes control bitcoin. He states things as absolutes that are not so.
Also, unless he gets into it in the second half of the video, he makes no mention of the Lightning network being built as a second layer. Increases transaction volumes, speed and privacy (bet he hates that!). Maybe he didn’t mention it because it’s not a layer 1 blockchain and that was the focus of his talk.
As far as what you and other CS experts have to say, my guess is you will continue to say it’s uninteresting, unnecessary, doesn’t work, and has no value all while the ecosystem continues to grow and evolve. Just being an expert doesn’t preclude one from being horribly wrong.