Yes, and dropping Catalina means Zig disregards a lot of not really that old and still powerful Apple hardware, except what on this list:

  iMac (Mid 2014 or later)
  iMac Pro
  MacBook (Early 2015 or later)
  MacBook Air (Mid 2013 or later)
  MacBook Pro (Late 2013 or later)
  Mac Mini (Late 2014 or later)
  Mac Pro (Late 2013 or later)

https://en.wikipedia.org/wiki/MacOS_Big_Sur

And by similarity of supporting last 3 macOS release, this will grow to hardware of ~2016 if they drop support of Big Sur next.

You don't have to use an unsupported, no longer updated, OS on any Apple hardware made in the last 20 years. Just upgrade to GNU/Linux.

Especially Void, the best distribution ever!

Zig will eventually support compiling to C, so any platform not directly supported that has a working C compiler will work.

We already support that. That's (part of) how we bootstrap the compiler :^)