Basically this is true but the browser (Electron) is designed to be single-purpose (your app) and has pathways to the filesystem that you can't get in a web browser.
Also, it is treated as an application by the OS rather than a Chrome window (and all the benefits that come with that shift).
That just makes the platform native, which doesn't say anything at all. Presumably the app itself is still written in javascript, so its not native at all - its just bundling its own (native) copy of chrome.
Actually, Qt (as in Qt Widgets) is a peculiar case. Qt draws its own widgets, but on some platforms uses native theming APIs to draw widgets (e.g. HITheme in macOS[1]). Though they are apparently experimenting with native widgets now [2].
So I'd say Qt is more native than e.g. Electron, but it is definitely not completely native. Except on Linux of course.