Apple Rejects iOS App for Using MoltenVK

It may be blocked ”for using moltenVK”, but that doesn’t follow from the information in the article.

I would guess Apple’s rejection letters don’t include the name of the function being called because they don’t have a name outside of Apple. That makes it harder to find a call to non-public API, but I guess (again) it still shouldn’t be too hard. The application would have to get the function’s entry point/name from some place other than Apple’s public headers, and that’s relatively easy to spot from the code.

So, do MoltenVK or this application make such calls?