could really use a nice short squeeze to flush out the crowded short traders
AAPL has around 1% of shares sold short, most are long the stock. That $92 level was key, and it broke, probably causing a lot of weak hands to get shaken out. The bar had to reverse quickly (see post above), and apparently it did with their $1 billion stake in the "Uber of China" and now the Buffett announcement.
You're right though, for those who were short in the 100's, probably now is a good time to cover. Betting for a "crash" on the most widely held stock among the main indicies with a very low short interest is fool's gold.