I don't consider myself a "turntable expert", but from what I once remember I think reading about Harry's/VPI's description, and theories about the 3-point system of the Platter, was that these 3 adjustable Pins were supposed to contact the Bearing Flange, thus offering some isolation, and draining off of resonances-vibrations.
When I got my VPI MK-IV Platter from a very reputable Agon seller, it did appear that all Pins were retracted to the point that they did not contact-touch the Bearing Flange. The runout wasn't bad, but thought it could be better. When I went to adjust by "eye", I knew I only made matters worse, and that it would be a crapshoot, only by a remote lucky chance that I could ever achieve the best adjustment.
Of course we cannot compensate for incorrectly punched Spindle Holes in an LP, or things like a Lip Warp, unless we can lessen it, with a Periphery Ring Clamp, or LP Flattener, I wasn't too happy seeing my wonderful ZYX Airy 3X bobbing slightly up, and down.
I of course have the vaguest idea, just how many High End Tables-Platters incorporate an adjustment system, similar to VPI, such as Galibier, Avid, Walker, Clearaudio, Sota, etc etc, but I would suspect that VPI are not the only ones. Perhaps this is an adjustment often overlooked?
I cannot comment if the one I bought is the same as on Amazon, I'll have to check. The shipment from Harbor Freight could've been slightly faster (A bad time of year to be buying things online), but all arrived perfectly packed. Mark