You left out the next lines, which add some important context:

> Then we tried wrapping a NextJS app inside Electron. It took us longer than we'd like to admit. As of this writing, it looks like there's just no (clean) way to do it.

> So, we gave up on the Mac app.

They weren't writing a fully native app. They started with a NextJS web app and then tried to put it inside Electron, a cross-platform toolkit.

All the training data in the world about native app development wouldn't have helped here. They were using a recent JS framework and trying to put it in a relatively recent cross-platform tool. The two parts weren't made to work together so training data likely doesn't exist, other than maybe some small amount of code or issues on GitHub discussing problems with the approach.