He has been saying this for
years now I remembered this topic resurfacing from 2018 and 2019 which makes me wonder why he keeps on saying this over and over again and this time via tweet with a lesson coming from his book. I don't know maybe it's just part of his marketing ploy on staying relevant in the market again to keep his book sales up but there is really no evidence that he is holding Bitcoin himself. So really this is the only possibility why he keeps bringing up Bitcoin just to promote his book from the process.
Because with the current situation it's a perfect period for him. It's like a reminder to say 'I told you', to stay relevant as you think. He has always been a gold bug (and they are all doing the same these days.)
Since some people consider Bitcoin as a store of value, he has the right audience to talk to; to spread wrong shady advice and regurgitate the same things he does for years