MAS App with Helper App

I have heard that a Xojo app designed for the MAS will be rejected if it uses Shell commands. Is this is true?
If so, how is it best to launch a Helper app (Xojo console app which is a resource inside a macOS app) without Shell? I assume an f.launch command would also be rejected.

Urban legend. I have two apps in the MAS that in fact wrap system shell.

When it comes to a helper, though, the regular shell no longer works for helpers (still works for system commands).

Thank you Michel. It’s nice when urban legends are proved false.