The author isn't suggesting a new consensus protocol, the essence of what they're saying is sha256 & secp256k1 is only computationally secure and there maybe a time where recovering stranded BTC from inactive wallets is a worthwhile endeavour.
It's more a question of motive. If you check their post history, all they do is paint doomsday scenarios about Bitcoin so they can pump whichever altcoins they happen to be invested in at the time. No one is going to take any of their suggestions seriously, because obvious shill is obvious.
Honestly my impression of OP is that they have a pretty low sentiment for crypto in general and don't see any long term trend of shilling. I will agree some of OPs beliefs are debatable and quite condescending but they aren't irrational. Their motivation isn't for monetary gain (at least I don't see that) more of a "I warned you" due to their continued ostracisation from the community. As you can tell I'm very new to this community and I hope the bell curve of crypto sentiment is symmetrical or else some black swan events may slip through the cracks...