I think you've misunderstood the article. Ad-hoc signing is absolutely supported on Apple Silicon Macs. You don't need Apple's permission to build your own software on your machine, nor to distribute it to others.
Disingenuous. "Signed software" is generally understood to mean signed with am Apple-issued certificate. The fact that you can ad-hoc sign with no certificate at all makes that kind of signing little more than a linker step. You might as well have said "you cannot run uncompiled software" for all the relevance it has.
I never understood "signed software" to mean anything else than "signed software", which includes "self signed software" since that software is also signed. And "self signed software" does run in Apple Silicon, at least for now.
