The expander works essentially as a switch, and doesn't see disk. Only the controller does, which means that the controller limits the the disk size, NOT the expander.
To clarify, these expanders, and the HP x1x series controllers they were meant to work with, support drives larger than 2TB. I'm running one in a DL370 G6 with the integrated P410i controller and it works fine with 4TB SATA drives. This is using all the latest firmwares (if these controllers are not at the current level you most likely need an HP controller to flash them). There's a huge forum about them with lots of good info:
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