We don't maintain the flatpak version of Sigil, but in short... No. Flatpak packages do not always have every little thing needed to run. You might be thinking of an AppImage. Still... Many people seem to be able to use the flatpak version of Sigil on their machines, so you should be able to get it to work. Try launching it from a command prompt and see if it gives you more detail on what's failing.
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