Regarding the plinth construction I have this from a very credible source:
“…just to let you know, the motor is resiliently mounted in a rubber enclosure to minimise vibration transfer. Then there is a decoupling system machined into the plinth, which consists of 47 wood layers skinned with metal (aluminium on top; steel underneath) to create an extremely low-resonance structure.
The plinth features an island between the platter bearing and arm to keep these components critically aligned one to the other. A three-arm decoupling system isolates this island from the plinth, blocking any vibration caused by airborne sound or residual motor vibration.
The high-mass platter’s weight is balanced by opposing neodymium ring magnets - effectively, it floats – while the platter bearing system produces negligible mechanical noise. Three adjustable feet combine with the high turntable mass to decouple the turntable plinth from the surface it is sitting on.
Platter rotation is provided by a low-noise, high-torque, brushless 24V DC motor coupled through a neoprene belt. An optical feedback system continuously monitors platter speed, allowing the motor drive electronics to make very small adjustments in seconds - maintaining absolute correct speed and pitch accuracy for the life of the turntable.”
tldr; not a Xerxes.