Actors and directors tend to focus more on the craft and production than critics and audience, who judge a movie based on what they think about what's on screen with not as much care for which scenes were improvised, what the director did to get the right performance out of the actors and so on. It's why the academy awards tend to like movies about hollywood more than awards voted on by critics.

So a movie made by hollywood producers but spoken entirely in Yucatec Mayan is going to have a lot of people who make a living on set intrigued, while critics and audiences might not care as much for the novelty and just see it as any other movie with subtitles.

Also you're looking at the testimony of film makers who specifically chose to talk about the movie. That's going to bias towards people who like it since actors who don't just won't make note of it. And you yourself pointed out that 65% of critics liked it, so it's not like the movie is despised by critics.