Pimax has said that the version which is available does NOT have a passthrough. (I was surprised by that too, since it precludes using the scent module with the hand tracker.) They didn’t plan for the 8KX USB port issue, which was apparently unanticipated.
See this thread: https://community.openmr.ai/t/is-it-possible-to-use-hand-tracking-with-eyetracking/28955/2?u=neal_white_iii
As for the hand tracker version with a passthrough USB port…
Why? Because he recommends running an additional USB cable from the PC to the eye tracker.