[kelnos]

Even if he said that, it'd be nonsense. Foreshocks usually do not precede larger earthquakes (https://www.usgs.gov/faqs/can-you-predict-earthquakes). Yes, sometimes they do, but it's uncommon. If every time you see foreshocks you predict a larger earthquake, sure, you'll very very occasionally be right. But you haven't done anything useful with your predictions.

(Note that I wouldn't be surprised if this is the kind of person who makes tons of predictions on Twitter, and then deletes the tweets when they turn out to be incorrect, leaving only the correct ones.)