What evidence do you have for this statement? It kind of doesn't make any sense on its face. Binaries are binaries, no matter what tools are used to compile them. Sure, you might need to use whatever platform-specific SDK stuff to sign the binary or whatever, but why would Rust in particular be singled out as being forbidden?
Despite not being yet released publicly, Jai can compile code for PlayStation, Xbox, and Switch platforms (with platform-specific modules not included in the beta release, available upon request provided proof of platform SDK access).