Did you watch the movie? The main character, Dek (predator) is the "runt", without spoiling anything, he has to prove himself, and hasn't earned to be equipped with the high tech gear yet, which is why he isn't outfitted like the predators we know. The same director did Prey. There's a handful of easter eggs that nod to the Aliens franchise and previous Predator films.

Did you watch the movie? The main character, Dek (predator) is the "runt", without spoiling anything, he has to prove himself, and hasn't earned to be equipped with the high tech gear yet, which is why he isn't outfitted like the predators we know. The same director did Prey.