Doesn't this license file say that most of ffmpeg is LGPL2? IANAL either, but my understanding is they are fine to distribute their application however they want assuming they did not use any of the opt-in GPL2-licensed functions, and they link to ffmpeg as a shared library.

EDIT: seems like the user has to install ffmpeg separately, so seems like they are in the clear anyway? https://hieudinh.notion.site/How-to-setup-CompressX-93a89b07...