She didnt lie. She just ... skipped some details.
Basically she had always knew about holo
She "wandered from place to place", "trying all kinds of jobs" (vtubers and non vtubers), but never an idol, she also wanted to go for a smaller corpos this time (which yura didnt make clear here but polka's speech is also hard to understand), rather than the biggest one a.k.a nijisanji due to her experience with upd8, her previous BBC (big black company), and hololive offered way less control "you have to become an idol through your own wills". Since they offer less help, they will demand less from you.
Note that holo didnt really blow up until myth which is 1 month after polka debutted. And she probs applied way earlier.
She also didnt jump ship. She got terminated.