The Bitcoins inside the wallet haven't been touched for 12 months,but some new crypto whale,who is entering the market would move them?You are contradicting to yourself.
The coins probably belong to some old and experienced crypto whale or a cryptocurrency exchange platform.
I'm pretty sure that more long term HODLers will try to sell their BTC,if the bullish market continues.
This isn't always a bad sign,if the demand for Bitcoins remains strong,the BTC price might not face a correction.