Probably an early miner, we’ll never know if Satoshi is moving coins unless they’re from his well publicised address(es). I’m inclined to believe it is an early miner. I mean there are active users on here who registered in 2010 so it’s not that crazy that there are really early adopters amongst us.
Sometimes early coins moving could just be early adopters moving coins to another type of wallet or device due to paranoia over a breach of their OPSEC or security etc.
I second that. I don't think these coins will be for sale anytime soon. Most probably just wallet-to-wallet transaction, wallet upgrade or something similar. Perhaps some Bitcoin forensics experts here can verify the destination address is not a custodial exchange wallet or something...