From the website today:
The platter material has been changed from stainless steel to brass, following the previous model's housing design of granite base, air float, and servo-less. With this change, even open-circuit type cartridges (*) using air-core coils are not affected by magnetic flux leakage, creating a quiet and expressive sound.
(*) Due to the open magnetic circuit and the powerful neodymium magnet used to secure the output, even non-magnetic stainless steel is magnetized, affecting the pickup of audio signals.