I may be completely wrong but from what I can figure out, firmware releases have started to split in two branches. There's the FSD beta branch and the non-FSD beta branch of software updates.
FSD beta firmwares tend to be a release behind [in features] than the non-FSD branch. For example, non-FSD version 2021.36.8 has the "Sentry Mode Live Camera Access", which only came recently on the FSD beta branch of 2021.36.8.5.
On the other hand, non-FSD version 2021.40 has TIDAL and the new "Traffic Aware Cruise Control Chime", which will probably come for FSD testers when they update to 2021.40.5.
It seems for some reason that Sentry Live View was limited to M3 and MY
This is still the case, but also Palladium Model S and the very very few Palladium Model X get them too, as
@McQ14 can confirm.
Only requirements are MCU2 and HW2.5+
The misconception here is that Notateslapp mislabeled the tag (seen in the dark gray oval) but not the vehicle identificators (seen in the light gray ovals):
The best proof of this is that all Model S' with the non-FSD 2021.36.8 software version that have Sentry Mode Live Camera Access listed on TeslaFi are Palladiums.
Green has confirmed that the Sentry Mode Live Camera Access is not even complied for MCU2 hardware on any of the [current] firmware versions:
So I think we just have to wait and see how this Sentry Mode Live Camera Access pans out for pre-Palladium Model S' and X's, specially considering the
Talkback Darth Vader voice feature will only work on some Raven vehicles that have the pedestrian speaker installed, of which there are very few.