If this is an intentional move, Apple is just acknowledging reality. UNIX(tm) is no longer so relevant compared to the early days of OS X, when Linux was still in its infancy and the Unix certification gave Apple street cred among developers. Most developers these days target Linux for production. That's why Microsoft developed WSL, not WSU.
> That's why Microsoft developed WSL, not WSU.
Developed WSL and discontinued SFU (Windows Services for UNIX), which they had since NT 4 days.
Linux has been effectively Unix™ for me ever since the days when Dennis Ritchie indicated that he used Linux for everything on his web page. Late 2000s at the latest, maybe early 2000s. Unix enough for Dennis should be Unix enough for anyone.
Sure, I just hope macOS doesn't end up doing some custom thing rather than staying Unix/Linux like, which we've had with macOS/OS X till now.