this post was submitted on 26 Sep 2024
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It's is M.2, but not the M/B+M key most M2 SSDs use but rather a A+E meant for WIFI/Bluetooth. According to this video it's essentially 2 PCI Express x1 lanes and USB 2.0. The video goes on to explain some possible alternative uses:
So while does this slot has it's uses, it's not meant to be used for M.2 drives but rather WIFI.
Sometimes there's only a single PCIe lane though. And as you say, that's not a x2 but explicitly two x1s.
No WiFi card needs the bandwidth (yet), at PCIe 3 speeds you've got around 7.8Gbps for a x1, and PCIe 4 double that.
The Coral comes in a "dual" version for exactly this reason (https://coral.ai/products/m2-accelerator-dual-edgetpu/) you just have to be very sure the slot you're putting it in is actually delivering two PCIe connections.
Also for bonus fun, most WiFi/BT cards use the PCIe interface for the WiFi and USB for the Bluetooth.