It isn't delusion - it's cope.
The RT Studio folks know their careers are over if RWBY gets picked up elsewhere. WB, Crunchyroll, Adult Swim, whomever - is not going to be bringing the studio with them. Miles and Kerry are 100% after driving RWBY into the dirt and the lack of professionalism the rest of the team enjoys (loose goals, deadlines, VAs who have other jobs, VAs with OnlyFans, working the entire story around a 'famous' cosplayers schedule) is absolutely gone.
When that's gone - so is any clout they have and they know it, which is likely the main reason they want it to keep going. If they really cared, they'd let it go.