Their last video is starring Armond Rizzo, he is a famous pornstar. And they have used other known pornstars before in their videos, Dante Drackis or Will Shokolade, for example.
I'd say they are all pornstars, just some are less known than others, and it does not help that they mention no names in the description. But, it does help to maintain this illusion of authenticity.
Besides, for bareback porn, professional studios need to go through those special HIV tests before filming, so you can't just grab people off the street and make studio-quality bareback porn with them.
As for acting, poor acting is harder to notice in a foreign language. Still, they maintain the illusion quite well for us to enjoy this particular setting. Personally, I more enjoy their earlier videos, which I wrote in length about in this post:
https://forum.gaytorrent.ru/index.php?topic=60647.0
For me, it does not matter much if they are actors or not, as long as their acting is believable.