look like phased array radar units.
Looks like plain radars to me, not phased array, especially since there are two of them with a small angle between, which would be useless with a phase array radar.
This is a plain classical automotive radar:
I don't know how the car pictures above give any clue there is a phase array radar.
On the other end, it would be strange if Tesla was testing only plain radars, since automotive phase array radars do exist now
Edit : ah, found this Tesla spotted testing prototype with new array of sensors - Electrek
Those packages say phased array to me because of the flat, square shape. That’s exactly the geometry of a typical phased array, to get the phase timing between elements correct for beam steering