Sir you really don’t understand. Its for like high end Roblox movie animations. You can’t export and import animations from Blender to Roblox or vice versa. You can export and import models but not animations. Yes the models include rigs. The plugin you provided is actually meant for making it so that you can animate in blender when you export your model.
trust me it works but as of rn even for me if i try to import a blender r6 anim into roblox it wont work on new places that i create but works on one of the older places i made which is the only way ive been able to import blender anims n save it to roblox