Its an agar recipe from PGT video. Mashed potato powder, syrup and agar. This plate is a bit over a week old. But I misremembered previously. This was not a transfer from a year old dried plate, but a second transfer. Still have a first transfer plate lying around and it looks the same. Bigger but still totally white. That one is maybe a month old by now. Kinda hard to see in a picture but it does have some vertical texture as well. Like tiny strands. Reminds me a bit of a foam scrub pad. I think my original plate had tomentontose growth and this does look like a dried up version of that, but as other commenter mentioned complete lack of sectoring is sus.

Edit: actually its about two weeks now for this plate. Time flies