The fact that they are calling them "Cast Members" like it's freaking Disney and not "Players" like they're actually playing a game makes me think this will be more fake Critical Role-esque "actors playing people who are playing D&D" junk rather than a real actual play.
I want to touch on this a bit.
Bhullar is a known quantity in the D&D world. I'm not even going to legitimate the "fake geek girl" conversation, but some cursory googling says that she's been a streamer since 2015 and pretty much all of her professional highlights has been as a DM or in the TTRPG space in some capacity; it's not like she's some D-list actress who suddenly jumped on D&D to boost her career.
Then we have Newbon and Wilde; I don't think I need to explain to you that, yes, these people are professional actors. It was well-reported during BG3's production that Newbon was the only member of the main cast who had played D&D, and that he taught it to many of the other cast members during production. So don't question his bona-fides either, and we can tell exactly when and how Wilde got into it. It's very transparent to me that various forces- probably WotC and the actors' individual agents- have encouraged the BG3 cast to learn D&D and play it to help their careers, and some (Newbon, Wilde, Beart) have taken to it more readily than others (Downie, Solomon, English). The thing is; so what if they're playing D&D to help their careers? They're good at it, it's fun to watch them, many people have sentimental attachment to them... it's chocolate and peanut butter, two great tastes that go great together.
If an actor learned martial arts or an instrument for a role, and then that sparked a love of that discipline, would you get mad at them for embracing it, or would you be glad that your hobby now not only has a new player, but a new ambassador to bring others into it?
That leaves us with Navarro and Berrin. Navarro, I guess I can see why your hackles would raise; he's a professional "good looking" actor and most of his roles have been hunks in teen-oriented shows. But the dude also starred in and produced an award-winning actual play show. If he was just an actor who signed on, maybe you'd have a point, maybe he was just a pretty face who thought "I bet nerds would love me if I played D&D for them", but he produced it; it was clearly a passion project and a labor of love.
Berrin is, admittedly, a total unknown. I believe she has some connection to Bhullar, but she has been in an actual play show before, and I see no reason to believe that her interest in the medium is any less authentic than Bhullar's.