Buffet was a great investor but it somehow got quite silent around him during the last years. Maybe as well because there isn't too much to tell about him anymore either, nothing really amazing seems to happen on his side anymore.
To be honest though, I think I wouldn't invest into any new asset class either anymore at the age of 87. It's just not relevant anymore by then and unnecessary to take such big risk.
Especially when you're a billionaire and you're set, he has other things to hold to his interest and this is just some buzz in his ear. He has many misses on emerging businesses. No one can get it all right, that's why he says invest in what you know. I respect the man alot, but while his opinion is relevant, it's certainly not dogma in this arena. I think the understanding the tech is just as important as understanding investing in crypto. It's a 10/10 hard subject on both tech and investment fronts. Knowing one side of that is helpful, but you need both.