We don't know why that much BTC was moved, or by who. It could have been a sale.
Exactly, it could have been one. Claiming that it was is inaccurate.
/pedantry
And saying it wasn't one is equally inaccurate. :D
Indeed, we agree on this. But I never claimed there wasn't one...
It was probably an exchange move funds between cold wallets. OpSec would dictate you need to move wallets as employees leave, leaks happen, any number of reasons.