I actually don't care about this because for me btc price will always fluctuate for various reasons. But when I look at this, maybe a bit worried, I don't know how many people in 10 years ago still own a lot of Bitcoin until today and sell it at the same time. So What you're though?. why are they selling it now, and not on ATH acouple years ago?.
Just because someone decided to move their bitcoins doesn't automatically mean that they plan to sell it, and even if they indeed decided to sell now, I see no problem with it. You are not the only one worried though with recent moves as I've seen some ridicolous theories on Twitter earlier today like "someone managed to generate private keys so that's why those old bitcoins are moving" lol.