Bought one of these from the same seller the other week as my T6 2019 PV didn't come with one. About 3mm thick plastic, feels pretty tough but a little flexible too. Certainly feels stronger than the underbody plastic that comes with the van.

A little bowed across the width whiy made a little harder to get some of the holes lined up with the threads in the subframe, but it's on now.

Cleaned out the threads with a tap first, slapped some copper grease on the bolts and on it went.
Haven't driven with it on yet so hopefully no rattles.