Not true. My 2015 car uses gps satellites to determine its clock. In 2019 there was a gps week number rollover due to a 10-bit counter rolling over. My car hasn’t had the correct time since and the manufacturer doesn’t distribute update CDs for it. I can set the clock manually and even change the settings to not auto update, but it resets every time I turn off the car.
So while yes the satellites just count seconds, it’s interpreted by other devices and the differences will confuse them.