I’m sure if you emailed them or mentioned them on Twitter you’d get a reply. Honestly I don’t expect someone from OzPig to be searching RU-vid for vlogs or reviews of thier products.
I’ve never seen it come off. The manual says there’s one and it needs to be peeled off before cooking on it. I’ve now had it going a few times and plate is warping slightly from being on top and getting hot. But no I’ve never seen the layer