I'd imagine that the update includes all the possible hardware, and the update script actually decides which components to use. Like apt on Debian or yum on RHEL.
Not had a chance to read it properly but definitely will be!
It appears that the Tesla is running a full Ubuntu Linux distro. And here's a small quip to entice passers-by to read more:
> With names ranging from “INDIFFERENT” to “SUICIDE_BOMBER”, there is a list of escalation strategies in the updater binary, which appear to be strategies for retries of downloads and user prompts on the UI.