I wouldn’t try it:

1. They don’t list the dimensions and I wouldn’t trust my eye on determining if it’s a 2230 length
2. It’s B keyed. It might fit in the socket, but you’d at best be operating at sata speeds
3. You don’t want to run an OS long-term off a microsd card. It’s possible, and a lot of SBCs do, but its literally my last choice of physical storage media for something I actually intend to use.

I’d get a really large capacity microsd and use the existing port or bite the bullet and get an actual 2230 M.2 NVME. Both will be less problematic.

I like the idea of having a single place where Valve’s hardware can be discussed, but the current name will make discoverability of such a community difficult. If the name cannot be changed, then I’d rec just leaving this one for only steam decks.