It seems confusing because it is confusing. I usually don't put much weight in those tags. I just look at the version history.
Those bits of information are very often wrong or partially wrong. Those tags are required during the submission, but I'd be willing to bet that most are only specified out of obligation, and were never actually based on any compatibility analysis. Also consider that a lot of FEX submissions consist of multiple tools with varied version and toolbox dependencies. The available tagging doesn't really work well to describe those cases anyway.
If you want to know anything about compatibility, look to see if the author has included any of their own statements about compatibility. If it's a smaller project or if you're having specific issues with getting it to run in your version, you might consider trying to contact the author or seeing if the forum can help clarify what the potential issues might be.
