There is no evidence that the special, breathable plastic wrap sold on ‘microwaveable’ potatoes transfers any residue or poses any adverse health concerns. While these potatoes are marketed as an instruction-friendly convenience to consumers, you can certainly microwave any potato as-is, minus any plastic wrap and requires nothing more than a rinse and skin pierce.
Here’s more information on the topic: https://idahopotato.com/dr-potato/using-plastic-wrap-to-cook-potatoes