Ah, I assumed that Persona is being used for face scans too. I haven't been able to find a screenshot of the actual flow, but based on this article [1] with a screenshot of the message UK users are receiving, I suspect they are:

>The information you submit will be temporarily stored for up to 7 days, then deleted. For ID document verification, all details are blurred except your photo and date of birth... [emphasis mine]

To me, that implies that Persona is/was doing more than just IDs.

[1] https://www.eurogamer.net/discord-advises-uk-users-that-they...