There is nothing really to assume. He has a book/writing business. Some of his core audience happens to be in the same market as Elite or SC video games and he has even expressed an interest in the possibility of SC related writing work. That writing business benefits from promotion and twitch streams seem like a good fit for it. He has promoted his business even in this forum
in each and every post. And he also explicitly promotes it every time someone clicks in
his Twitch page plus whenever he mentions it on screen obviously. I mean, it is not as if you can miss it. As mentioned above by others as well it is clear he does not really
play neither SC nor Elite, not in any "serious" manner at least.
If you enjoy his content is a win/win though. I particularly liked his Salome shenanigans, directly linked to a book promotion. Nothing cynical or assumed in his agenda and nothing wrong with it. It is what it is. But not sure why some folks try so hard to ignore it