Why? What are the evidences? Even if it's false, the messages are interesting and well aligned with what Satoshi would actually say. If it's a troll, it can't be denied that it's being well executed. They could have easily spouted nonsense instead.
Is that not what they did? We've known Satoshi's key is compromised since Craig Wright tried to claim ownership years ago. The other comment is right: move the genesis block or GTFO.
The financial benefits someone could get from stolen notoriety is enough evidence that this is a scam.