Honestly can’t hear anything wrong with it, the composition is phenomenal, the mix is commercial quality, it’s a really solid track. I agree with @Soundset but I have a complete hail marry idea since it’s not like you have anything to lose. I wonder if the reviewer could have felt like the addition of the vocal sample made it less versatile? I’ve noticed tracks with any kind of vocals get denied more often than instrumentals, it might be worth removing the vocals and resubmitting, at worst it’ll get denied again and you’ll know that the reason is just the sheer number of tracks in this style on AJ, at best it might get accepted as a purely instrumental piece. Either way don’t get discouraged! You’re very good at what you do and AJ is just incredibly picky, their rejections often have nothing to do with quality.