Grayjay is ran locally, so they cant block the datacenter traffic like they did with invidious, but even if they managed to do something I'd probably still use grayjay, since I can follow the same creators on all platforms with it.
That's odd, I'm surprised Rossman didn't upload it to that app store.
Well, in the meantime you can get it directly from https://grayjay.app/. Should also be the first result in google, if you want to search yourself instead of trusting a randomly provided link.