Does his opinion about Bitcoin matter anyway? Whether he keeps making negative opinions about cryptos or "changing" his stance about Bitcoin. I don't think it does matter. The long term success of Bitcoin can't be affected by opinions of a few old school folks, so this shouldn't even make news at all.
Just like if Elon Musk tried to tweet positively or negatively about Bitcoin right now, do you think markets would react like it was in the past? I doubt.
at this moment. buffet is not much of an effect. because buffets effect is on traders that buy stocks and shares. and because there is not much of a truly viable bitcoin ETF industry available, those traders cant really put much investment into bitcoin anyway, because there is no regulated/insured investment trust for pension portfolio managers to buy into
however elon as a private rich citizen talking about personal investments. speaks to many other rich people who are looking to follow elons path to riches. so those types of people can be affected. (though small in numbers, large in volume)
but luckily majority of them are not easily swayed by a tweet
most of them monitor other richguys SEC filings of investments. long before it hits the public twitter feeds.
they know when someone is shouting buy X on twitter.. its because the shouter has already bought along time before and is looking for a price pump so the shouter can exit/sell.
or if twitter feeds are saying "dont buy" its because they shouter doesnt want the competition. because they want cheap coins to remain so they can hoard up more before the competition jumps in
so the majority of smart people just dont listen to those cries on media platforms, as its too late to buy in when someone is publicly shouting to buy.
(after all if you found a cave of gold just siting there easy to pick.. would you tell others about it before you were able to grab as much as you could cheap.. ofcourse you wouldnt tell others early on. because then you are causing competition for yourself)
but some smart people would be watching if you were buying up some land near a known gold vein, and then follow you by buying nearby land too