Nikkei soared 10% this morning, reversing almost the entirety of its decline on the previous day.
Maybe the financial pundits will explain this as related to the American economy.
For myself, I stopped long ago expecting pundits to know what daily moves in international stock markets are about.
Buffet is a wise man, but he doesn't time things based on a day's events. He may think the stock market and/or Apple is over-valued, as you say. But he often makes short-term errors. He does well over the long run.
The Fed will probably reduce interest rates pretty soon, which will cause some rotation in the usual way.