Markets evolve just as anything else. I also have no doubt about Mr. Buffet knowledge. I don't think anyone does. But it is clear today financial technology and markets (especially distributed ones) has nothing to do with the markets he has dealt most of his career.
On the other side, his fortune is based on traditional instruments and he probably feels fear the same way traditional financial institutions do when they feel they are losing control, specially into something is hard to control.
At 87 one should be wise enough to just listen to the new generation instead of just throw junk into the market when not understanding.