Lol, no one knows if this is Satoshi's wallet or not. It could have been a early bag holders who just decided to touch his coins for the first time. Or someone who forget all about it, find his private key.

In any case, if this is just hundred of bitcoin, it wouldn't put a dent on the market right now. We are already huge, trillions worth and billions of transactions. But if you look at the price right now, we have rebounded again to $43k, so if there is an effect, it's a positive one.