Let's face it, with the Schwarzenegger vehicles like Terminator Genesys (5) and Dark Fate (6) bombing hard, along with covid-19 decimating hollywood, he needed this videogame gig as his star has fallen.
I think the casual Predator fans mistook the tweet as new a live action PREDATOR movie being in the works.
For PREDATOR extended universe fans, this is probably your version of a new Dutch Schaefer film.