Huawei AAUs naming

Hi Experts,
Anyone has experience with Huawei naming of their AAUs?
For example HAAU5213 in mmWave 27 GHz is advertised as 4T4R but in reality it has 768 antenna elements (for each trx an array of 16 horizontal antenna by 12 vertical antenna is used).
Then what 64T64R would mean in FR1?
I thought this could be csi-rs ports but this is not possible since csi-rs ports can be maximum 32.