This is JO1. They are the first group from Produce Japan. They are entirely managed by a japanese company with some loosely affiliation with CJ Ent because of the brand name Produce 101.
NiziU is under JYP, has korean staff and their vibe is more ''Kpop'' than JO1 in my opinion. I get NiziU is meant for the J-market and they should continue on that. All though, I think Jyp should let them appear on M Countdown, Arirang Simply-Kpop/After School, Studio Choom and maybe The SHOW as well. They don't need to go 100% promotions in Korea, but some guest appearance here and there should be enough. If a fully Jpop group like JO1 can go to M Countdown, why can't NiziU as well? Seeing NiziU on KCON, I saw the girls got a great kick being on their first korean show and also being with other idols in the same age range like them.