@bdp24
Well, you have jogged my memory and there was indeed a short-lived 3 part platter initially introduced in the TNT II and no doubt carried over to the Aires. I do, though, remember the black plastic as acrylic including for the base of my TNT which is entirely of the black acrylic. At least, the platter was always referred to as acrylic in the reviews and they could only have gotten that from HW. The acrylic and lead platter was first introduced in the HW-19 as an upgrade to the original aluminum-lead platter. That platter was very well received for its SQ in TAS. In any event they stopped using lead shortly after the first Aires IIRC. Perhaps I misunderstand something you wrote about the TNT V. The platters in the TNT V used a non-inverted bearing so they could not be used in the Aires 2 if it is set up for inverted. Or are you saying that the TNT-5 was changed to an inverted?
I believe there was a period during which they used the all acrylic (clear) platter on the TNT V and later offered the stainless-acrylic (black) as an upgrade.
As I wrote, I think they dropped acrylic for its cost and the original bearings for the same reason.