To be safe, I would steer clear of referencing that website.
You can tell players about this merchandise on external platforms like Discord / Youtube (which are legal by Roblox ToS).
Though, I am not sure if selling merchandise to redeem in-game things is allowed, so steer clear of that as well.
Got it, thanks
Not to throw names or anything but I could’ve sworn big games or some other group sold merchandise with redeemable codes that would give you items in game which is why I was curious.