Yes, that is correct.
I will also add, Standard Connectivity loses the ability to visualize traffic, but live traffic data is still taken into consideration during navigation.
Additionally, Standard Connectivity will typically only receive firmware updates via WiFi, unless Tesla deems the update to be critical. In that rare case, the firmware will download over LTE for both Standard and Premium Connectivity.
There's also some good information on this support page, particularly the FAQ bit toward the end: Connectivity
Thanks very much @willow_hiller ! Before I pass my post and your reply on to my friend I just want to be sure I understand your distinction correctly. Currently if she is Navigating (but driving w/o Autopilot) with the free premium, if there is an accident ahead delaying traffic, her screen will show the upcoming stretch of road differently so that is clear. It might adjust it's recommended route based on this data .
If she doesn't subscribe and drops to standard, it would still adjust it's recommended route but not visually show her why that is a good idea.
Thanks again for your help!