This is definitely not true. The engineer explicitly stated that Tesla only gets data when trigger conditions are met (and that this was in fact always the case), so most of the miles that Tesla drivers have been driving was actually never even sent back to the mothership for use in ML training.

IOW, despite Elon claiming for years that they're ahead because of the "millions of miles" of free data collection by Tesla drivers, it turns out once the engineers on the ground actually speak...they're actually pretty far behind on the data front, and most of the data they are getting is the same safe routes over and over again since they're not trying to put Autopilot into novel situations to acquire new data or test the ML algorithm's capabilities to handle unique/novel situations (like trucks turning in the highway, or freeway dividers).