Enhypen are under Belift Lab, which was co-founded by CJ E&M and Big Hit Entertainment. BigHit only produces their music. They are not directly BigHit Ent managed, unlike BTS and TXT. I know you want to think it's all BigHit, but their are various people that make up the various sub-labels and the ones who handle TXT are different than those who handle Enhypen.
well, i also think the sub labels that SM owns, is also SM not managed but they're still under SM somewhat so deserve their name, same with gfriend 17 etc