I'm not sure Nvidia is in trouble. Investors who overestimated their future performance might be.
The problem is that management did not do enough (as far as investors were concerned) to temper market expectations. It may have been they truly did not know who was buying their product, and they believed most of their clients were coming from ML and gaming, when instead it was heavy, heavy crypto.
Other than that, as the article mentions, it was trade tensions that turned the quarter miss into a perfect storm for a sell-off.