I am not implying anything. But try to download an older version in a store like steam or gog, or other places. It is not a common feature. If you want upload and offer older versions you can do that on your project page, just use different file names. You can even have links to external file hosting.
I doubt they will tell you why your game is quarantined. It is speculation, that this has to do with the positive results of virusscanners. Could be any reason. There are many godot games on itch...
I also was surprised when I first read about that. One would assume that the game engine makers would be aware of such things and tried to avoid it.