according to the avid website that is. (
https://www.avid.com/pro-tools/comparison than Key Features\ Maximum inputs (hardware dependent) \ click on "more information")
Other hardware uses ASIO driver and asio is limited to 32 i/O's
I do think there's a way to go the DANTE way but I'm not skilled in that (only using HDx here) to know if this exceeds the 32 limitation. I suspect you will be able to route more than 32 in/outs but only 32 In/outs at the same time for recording/playback)