What you should do is to assume that a player is average to the stakes you play until you have sufficient evidence that he is not.
Clearly this guy is loose, but how loose? we have no idea.
Stats take a long time to converge, less than 2-300 hands ist meaningless.
When you have few hands on a player, SD hands are more important than stats. If you see someome barrell 3 streets with air.. that tells
you far more than stats generated from 19 hands.
Sometimes at the start of a session, I will glance down at my own stats and they can be crazy yet by the end of a session then will have settled down.
Trying to adapt too quickly is a mistake in itself as most of the time, the villian turns out to be an average opponent. If most people didnt turn out to be average, there would be no such thing as an average.