I’ve assumed the terrible writing was helpful to him. I don’t think it’s on purpose - I think that’s how he really writes. But it serves to select people who respond to that kind of writing, and make others tune out.
Scam emails and text messages use a similar thing: they really want to reach people who find this convincing, so they make it a bit bad on purpose. They do not want the undivided attention of people who might be clever and onto them.
