So it turns out that some infractions in some jurisdictions are "owner liability" and so all the authority needs to do is cite the registered owner, because they're always responsible for anyone who is permitted to drive their car.

If the jurisdiction is not "owner liability" then it may be necessary to ID the driver instead, but the ticket is still sent off to the registered owner for handling, because the ticket and the car and the driver all go together.

Regarding a sibling query if the car is stolen, I'd say the owner has bigger fish to fry, and therefore would have reported the incident already, and so untangling a speeding offense would necessarily involve documenting the report and the incident of theft prior to those infractions. It may get a little sus if the owner said "hey my car was stolen and then returned to me just around the hour this photo was taken! it weren't me bruh!"

Let's not forget all the disparate jurisdictions and patchwork of laws which make up this sort of scenario. We can never make blanket statements that cover every situation.