For me the main problems with G/F's RD are 1) lack of competitive experience at this point, which is fixable and 2) they're actually trying to do the 90s, which is...
Look, the teams that have done best with the theme so far are the ones that have gone: okay, take 1-3 iconic/cheesy 90s hits, maybe reference some iconic costumes, and completely ignore the requirement for 90s dance styles, and instead just do their thing. In showing that they understood the assignment (extremely well, to the point where I was having disconcerting rage flashbacks*), G/F have in fact failed the assignment, because the assignment as written is not passable.
*Not anger, but an iconic and long-running late-night music video show on the ABC.