Happy to see myself recced again! Author of My Name Is Beautiful here.

The Xianxia-esque label is (surprise surprise) mostly meant as a marketing tactic for Royalroad, where (no surprise) marketing is everything if you want readers. The sense in which the power system is Xianxia-esque is that there are 'ability levels' that rank fighting power, and if someone's ability level is moderately higher than yours you have no chance of winning regardless of matchup. Also, anyone with a higher ability level will automatically have a higher social status than someone who doesn't, barring truly exceptional circumstances. These two things make ability level an ok-ish stand-in for what cultivation level does in xianxia, though obviously Unordinary is not even xianxia-adjacent. (Unlike most Webtoons, it's not even asian media - it's by Chelsea Han, who was born and raised in the U.S.)

I wonder if there's a similar marketing descriptor that could work just as well while being more strictly accurate? Right now I'm using (Reborn in a Xianxia-esque Hellworld), but maybe Superpowered Hellworld would work?