Do they have to be special sauce drives? The picture makes it look like standard M.2 drives. It doesn't seem like you should need anything special if the T2 chip is just acting as a bog standard drive controller that happens to send only encrypted data to the drive.
I believe those drives are just the flash, as the T2 chip actually acts as the controller. That might be wrong but that's what I've gathered from how the iMac Pro works and I assume this is a similar configuration.
