Yeah... no... It's complicated. One of the invariants of this forum is that somebody will always post how macOS releases are aligned with new Mac hardware, and that's not really true.I’ll agree that Apple is only consistent with iPhones and iOS, but by and large, when they have Mac releases in October/November, you can usually rely on macOS coming out a week or two earlier. Even iPhones aren’t 100% if you consider the iPhone SE/16e. iPad hardware releases are all over the place, sometimes in October, sometimes in September, sometimes in March of May. There are so many Mac models that there is no way to predict when anything comes out, but we generally expect something in October. Soon, iPhone non-pros will move to March while Pros and foldables will come out in September.
We can usually tell when macOS comes out by its beta release schedule. All the OS’es but macOS tend to go from bi-weekly to weekly earlier than macOS does. The gap between the transition will probably tell us when macOS comes out.
First, since the hardware releases are sprinkled over the entire year (I'm hard pressed to think of a month that didn't have a release in the last decade), they're bound to have something close to October-ish, but that doesn't mean coordination. The MacBook Air is the most popular Mac, and that hasn't coincided with a macOS release in a long time. The M2 MBPs and the M5 ones (according to Gurman) are definitely not aligned with macOS.
I think the actual situation is that iOS is a must to have ready for the September iPhone releases, releasing macOS within a month or so after that is a goal (not a must), and it tends to be an even looser (note that I'm using the word correctly, it's not a misspelling of "loser", rather I really mean "more loose") goal is to release new MBPs sometime in October or so, but they've been known to miss that goal. And again, that only applies to MBPs. All other Macs tend to be all over the place to begin with.