In particular, if we use a commonly available compiled/interpreted language (for example, Python), can we simply distribute the source code? Source code is not labeled with a platform by itch.io.
I feel like the jam is an opportunity to learn about and put effort into packaging for Linux. If I were doing a python game, I'd be shipping a launcher script or app that could inform the user of what's going wrong and what they need to do if they don't have Python installed, etc. "Linux compatibility" is one of the rating criteria and I feel like just submitting source code alone in a way that's going to require the user to have familiarity with a language and its environment is probably going to
Assuming your game has assets and that you're packaging those with the source, then that's more than just source code.