I see a big difference between a reverse (outy) thumb-print and what's been described here.
Pat -- the 6th green at Lawsonia I'd suggest is more of a sharply tiered, two-tier green, almost shelf-like because of the smallish portion of the green that sits below on the left side (looking at it from the fairway) of the green. I wouldn't characterize it as a thumb-print.
Others shown or described are more of the pimple-buried elephant variety, as opposed to a thumbprint. I assume a reverse thumbprint ought to occupy a significant portion of the green, and be somewhat symmetrical, oval-shaped in nature.