D9 Status Report states need "at least 4.0.0"

I am running Drupal 9.4, and FullCalendar seems like a perfect fit for this project. I initially installed version 8.x-1.x, however I noticed that other than the main "FullCalendar" module, the others reported that they did not work with 9.4, so I upgraded to 8.x-2.xdev, which resolved that issue, however, while I have followed the instructions given, the Status Report screen shows:

At least 4.0.0
You need to download the FullCalendar plugin
and extract the entire contents of the archive into the /libraries folder of your server.

I had attempted first, to use the included code, which calls for v3.9.0, and then found this error. Looking at the Github repo, I see that the current version is 5.11.3 (and, looking at versions, oddly, I noticed that there isn't a version 4.x, it goes from version 3.9 to 5.x), however even after updating the provided COMPOSER.JSON info to reflect 5.11.3 rather than 3.9.0, and even after completely removing, and reinstalling the library and modules, I still get this same message. When I click the link that is included in the Status Report message (http://arshaw.com/fullcalendar/download) it redirects, taking me to https://fullcalendar.io/docs/getting-started . Based on the Changelog.md file in the resulting /libraries/fullcalendar folder, I have installed version 5.11.3, which would seem to satisfy the stated, "At least 4.0.0" requirement. I had even thought perhaps I needed to downgrade to version 4, but as I mention, at least based on the versions listed in the Github repo, version 4 doesn't exist.