It's "supported" in the sense that it runs, as do many PyGTK (and PyQt, and pygame) apps out-of-the-box : they have a single code base that works on anything that has the necessary runtime libraries.
It's not a maemo-specific version however, so it's not "hildonized" (menus and keys), and most of the time theses apps run into problems because they're not designed for small screens : text too small to read, icons too small to click, buttons outside the viewing area...
Maybe KeepNote is an exception, I haven't tried it, but generally a native app will have better usability, even if it doesn't have all the bells and whistles. For example I love the SciTe editor on the desktop, and there was a version that ran on Diablo, but for actual editing on the tablet it's a lot easier to use Khetan's PyGtkEditor...