Native Chinese speaker here @ the previous retro about "kxi not looking underaged" in the art, it's literally captioned "16 years old" which you can find from clicking the translate button. As for the second part of the post, it's censored so difficult for non-native Chinese speakers to decipher but it's a censored version of this phrase: "OP is p3do again" where the artist is referring tk themselves.

Many of their older posts also have the caption "OP's p3do kink is acting up", "OP's p3do again hehe", so if your issue is that kxi "doesn't look underaged" therefore rem wasn't right for making the post, you need to get some facts right first!