This “free ugc” item that i purchased more than 30 days ago cannot be listed on the marketplace. It has 55,773 sold out of its 100k stock meaning that the item can still be earned in the game it is sold in. Spy Kids Spy Suit - Roblox
The ability to sell “free” limiteds should be solely based on the 30 day holding time, as there is no guarantee that a “free limited” will ever sell out.
Limiteds can be resold by premium members according to the marketplace fees and commisions. As far as im aware there is no option when creating limiteds to make them un-resellable. That pop up is just repeating what i said, that its un-resellable despite the 30 day holding period being over.
There is an option to turn off resellability for UGC Accessories before turning them into limiteds. Roblox introduced it recently so the confusion is understandable.