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Alpine Ridge didn't work without the proprietary header at all.

Titan Ridge worked to an extent -- but usually it couldn't add PCIe buses so the number of PCIe devices connected to your desktop TB3 card at boot defined the limited until the next reboot. You could remove and add different devices as long as they didn't need extra PCIe buses compared to what got reserved at boot.

Can't see why Maple Ridge would work differently.

The photos of this card show a header JU4_1 which has a different pinout than all MSI motherboards' Thunderbolt headers I know so far, so I think it won't even work in current MSI motherboards, just future ones.

These kinds of boards always require proprietary connectors directly to a supporting motherboard and the image shows some extra pins next the power connector. So I suspect this card isn't any different

There was some hope that someone would make a USB4 expansion card that didn't support PCIe tunneling, which wouldn't need those extra pins. If this card isn't it, then literally the only interesting thing about it is that it doesn't use an Intel controller. Which really is a negative.