nope. the actual reality is
someone deposited 8000btc into coinbase pro wallet
yep its a 8000btc movement not a dollar deposit
(dollar deposit=buyer)
maybe that someone sold some of those coins but not all.. however unlikely right now
coinbase pro's volume for the entire day of all traders is $127,627,412 = 2320btc
so that 8k hasnt been sold yet
coinbases daily trading volume average is ~$200m=~3600btc
so with there being an 8k btc deposit. expect either a sell off to a factor of 2-3x daily volume either quickly in one day or slowly over multiple days
..
heck the wallet movement may not even be a user.. it can just be a hot/cold wallet shift internally