I stand corrected! Thanks for posting, as I had a limited experience and was happy that most of my applications fell into the first category below:

I just tested it out and some applications like GIMP and INKSCAPE appear as a result and when you click on it, it has a drop-down in which you can choose between the flatpak and deb version. Unfortunately the flatpak is the default choice, so many people would probably never even know about the alternative choice.

Other applications a clearly different, and it's not clear what you are getting. Like VLC.

Then you have some like BATTLE FOR WESNOTH that shows two results. One of the two (if you activate it) has the drop-down, but both choices are flatpaks. The other result is apparently NOT a flatpak, but not clear in what it is.

I now see I have more flatpaks than I believed I had. They are working nicely at least, the ones I am using.