Things that had no value at all are worth millions of dollars and granted him the title of "millionaire".
Rather than jumping to the conclusion that this early adopter is "cashing out", we could consider that they're moving their coins to SegWit-compatible wallets - something which people with the opportunity should certainly be doing.
Well that's still actually a possibility but we'll never know since these addresses are brand new. Actually the scenario that the coins got sold is acceptable.
Maybe a new investor bought ? and just created one address and the other is the exchange address of the owner.