"Most of them." Lan Wangji has very little issue with the illusions. He brought out of the one he was under very early. He has the little crystal to support him but he hardly needs its support in something like this. He has been training his mind since an early age.

"I destroy the fakes." Which means everything caged is already confirmed to be real and ready to be returned. He will collect a couple more cages and follow Yondu with them. He just wants to make sure they can't get out and hurt anyone, can't get hurt themselves, and no one else has to try and work through if these are real or fake.