Pretty sure his saracastic point was that whatever race/ethnicity/gender the actors and who they portray are shouldn't matter, as long as the movie is good and entertaining. Current trend for movies is trite sociopolitical narratives and representation first, ensuring you make a good and entertaining movie a distant second. Forget movies, even the most recent Marvel shows on Disney+ follow this trend to the point of absurdity. People seem to think that all representation is groundbreaking, when ethnic/gender diversity was done all the time and considered normal back in the 70's, 80's, and 90's (and usually without sociopolitical motivation involved). Perhaps people here are so young that they never lived during those decades and just believe the narratives they hear, or they've just memory-holed the past to that point. It's really not hard to find fun and entertaining movies pre-2000's that could check all the boxes that 'need' to be filled nowadays, the difference is that entertaining audiences was king.
Anyways, with respect to the Eternals specifically, I don't see any energy surrounding this film. From the very limited visual media to the film's news stories mostly being puff pieces that tell you virtually nothing that matters, it's almost like Disney is worried that this film won't be received well. If we go by the teaser trailer, as other have stated it's very generic and tells you nothing of importance. It just jumps all over the place, which makes one wonder how jumbled the movie will be. Furthermore, considering the cast of 'main' characters... that's a lot of characters you'll have to build up and explain. Not only are they pretty much nobody characters to the average movie-goer, but also that means you have to spend that much more time getting the audience attached to each new character (which will likely leave little time for actual plot).
I've already seen some comments about this, and it should be a problem that the Eternals didn't do anything during the Infinity Wars saga since Thanos is an Eternal from Titan (at least in the comics, but it's at least inferred in End Game when describing his past). I have this sneaking suspicion they'll just be lazy and do the "We would've, but we had other pressing matters to deal with...", which is super lazy and basically what they did with Marvel to explain her absence during Infinity Wars and most of End Game. I've already heard word that they're nerfing the power levels of the Eternals, but I'd hope they give a good reason for their lack of intervention when half the universe was wiped out.
Regardless, I think Marvel is going to start having a difficult time with the direction of their franchise when it comes to the stakes in any given movie. Once you start going up the food chain and the power levels increase, I fear eventually every movie will end up having the stakes always being some world/universe-ending level of disaster... and that tends to fatigue people. Even with nerfed power levels, it'll be hard to keep everything grounded enough that audiences will actually be invested in the stakes. If we circle back to the Eternal's teaser and the obviously thrown in line of them only observing and not interfering until now, the stakes have to be higher than wiping out 50% of life in the entire universe... which is already huge in terms of stakes. Any movie involving them will have to be of that scale, otherwise there's nothing really to do with them.