To be fair, there was initially some very justified excitement around cryptos and BTC in particular. Once the drawbacks became obvious, it's totally fair to change one's mind.
Am not sure you can give him that much benefit of doubt. He was promoting btc heavily way after the initial excitement of crypto up until the end of 2019 (he gave a public lecture in Lebanon where he suggested it and blockchain technology are a good safe haven and solution for the country's currency crisis).
He was basically a fan and promoter from 2015 - 2020, that is a really long time for a critical thinker like him not to notice the flaws. I think he was blinded by his ever growing fanbase he had in the BTC community.
BTC didn't really go above $12k in 2019 so anyone who bough in then and held would be ahead still (at about $19k now in the current slump). Maybe the flaws weren't that bad.
