So by your standard if I embed a windows emulator that runs a windows app I have created a Mac app?

Yes - the mac app is not the windows app though, it is the entire package of emulator + windows + windows app.

If it's not a mac app then what exactly is executing on the mac?

Yes, if you can embed Windows in a Mac app, you have created a Mac app. Parallels is a Mac app, too. If it looks like a duck and quacks like duck, it's a duck.

That’s the thing. Electron apps and co do not quack like a duck. They feel terrible and out of place in the macOS ecosystem. They are not Mac apps.

And the same is true of some apps made by Apple framework too! Catalyst apps are (almost always) terrible, including the ones done by Apple. The only exception I’m aware of is Messages, and even that one is not perfect.

They are apps that happen to run on a Mac. Not Mac apps.