Checking an address at random, 1LcXaKkBRWcVVAYZbsuuD4kJKsUhZfk5Po it received over 57.02BTC between 2016/17 and all were withdrawn from that address in the current year, 2024. Perhaps the user was waiting on the halving to see what the holding could amass to and at a good enough price, holder has taken profit in simple terms.
This could be the case, however, that address has been holding this coins since 2016/2017, and moved them on the 24th and 28th of last month. So just thinking aloud here, if that bitcoiner has been waiting since 2016 for this year's halving, then surely they would be able to wait longer until we see the 'real' effect of the halving this year, which a lot of people expect to be ~ $100k.
So i think this bitcoiner may have moved their coins to another wallet for better security, maybe a new hardware wallet or they set up a new airgapped wallet. This is just my own idea, and it does not matter to any of us what the bitcoiner did with their coins.