It may not move the market that much to make a significant impact on the price, but it undoubtedly considerable knowing that at any moment, they could just be moving these volumes and create a larger one with one swing. Unless the exchanges are also monitoring what they have on members, specifically whales, then we have nothing to worry about.

It's probably a very early adopter moving his stack of BTC somewhere and cashing out. That amount of BTC is a lot for sure.