With that said, kids often enjoy enrichment activities, and it makes the school week more bearable, but I don't often find that they're learning critical skills in there (I'd love to hear examples of the opposite). Given that they're already open to fixing this in a couple of months, I wouldn't necessarily make this my hill to die on. It might be worth saving some of your political capital to spend on other things later.
I thought this initially, but apparently, my DS, who grade accelerated in late elementary and did enrichment or extension pull-out 2-3x weekly in the new grade level, ended up accelerating an additional year in math, then still found pre-algebra wasn't much new, so his GT teacher was evidently giving the kids exposure to advanced material. Whether and how much it sticks is up to the kid, I'm sure.