Yes, you can argue for another plausible interpretation of those two words, but in actual usage "Native UI" has always meant the platform's native UI framework.

A lot of people started to refer to Qt as native around Electron's time. The only place where Qt is native as such in on a KDE Plasma/LxQt desktop.

You're correct, although Qt attempts to do fake native widgets on Win / Mac, and given how relatively lightweight it is compared to Electron, it's understandable how it became a obviously point of contrast with the latter, which doesn't even pretend to be native. Given a choice between the two I will obviously take fake native widgets over nothing.

I, on the other hand, will take whichever widgets have the better accessibility implementation. Currently Electron beats Qt on this.

> but it's pretty clear from context that they mean the former

It absolutely was not clear, which is why I checked the website and then pointed out the lack of clarity.

At first my thought was "Wow, nice, another UI toolkit that uses native widgets, that's good!" But, alas, it was not to be.