Indirect systems "fell out of favor" because the original designs could not meet the performance requirements of the DOT when they started mandating systems in 2005(?). To meet the DOT requirements, direct systems (with a pressure sensor in each wheel) were necessary. Manufacturers have improved indirect systems so they can meed the DOT requirements, so many are switching to them for cost savings over direct systems that use a TPMS at each wheel.
The Tesla system is a direct system, with a sensor at each wheel. As discussed many times in the past, they have access to the individual tire readings; the just choose not to give the info to the driver.