Here's the fun thing. NHTSA doesn't have to test. Tesla can run the tests themselves and self-report to NHTSA that it meets the criteria.
It says this right on the NHTSA pages:
This is how brand new cars (like the Y) come onto the market with these checks already active- they were self certified by the manufacturer.
The "waiting for NHTSA to re-test" is a distraction by Elon, using his favorite "regulators are slow" excuse. Tesla can run the tests themselves and self certify. They could have done this before they released the software, and told NHTSA, and never lost the check marks. NHTSA then may or may not audit that (And it's really bad if you say it works but it doesn't), but they won't remove the checks until they have proof it doesn't work. The only reason not to do this is if the car doesn't actually work well enough yet, and you think a software update "next week" will fix it.
Yet....