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The files are dead simple, you can read them yourself. There is nothing wrong with them.

That said, you don't actually need FEF or FOF anymore. We stopped using them almost three years ago, when we released the first versions of our software for Joomla! 4. You can uninstall both FOF and FOF now.

First, do check extensions for FEF without any other filter.

If something comes up, uninstall it.

If nothing comes up, you have leftover files. Delete the folder media/fef.

Please remember that Magic Eraser is NOT meant to be used on Joomla! 4. It was only ever meant to run on Joomla! 3, prior to updating your site. It was meant for preparing a site for upgrade.