Do you have a source that they don't already support some sort of SVE? I don't think they would make this public information if they don't have to. As far as I can tell they wouldn't need to recompile any previous ARM binaries so this could remain under the hood and they would never need to tell you whether or not they're doing it. So I'd be interested if you have any source on this.
I don't think anyone has found any SVE being used by Apple's binaries. Sure, it could be there, hidden, but that would in practice mean that applications can't use it regardless.
