Interesting. I figured this one might be closer JH's "infinity" story and "Thanos Quest" than "Infinity Gauntlet", so maybe the interviewer didn't ask the right questions with that.
That's my impression as well. The Black Order and the Wakandan set piece is straight out of Hickman's Infinity book... which is only 5 or so years old. But even then, there were so many different things going on in that book, that there'd honestly be no point in the actors reading too deeply into that either.
They're pretty much crafting their own rendition/interpretation of Thanos's arc while adding a lot of memorable/nostalgic concepts from the various books