Of course they are. Electronic sensors provide vast amounts of data, much of which is nonsensical (no pun intended). This is knowledge from the first semester for electronics engineers. Temperature, humidity, engine temperature, even vibration - this is the normal habitat of sensors. This is their fateful destiny.
The trick is in the filtering. I've had many a battle with implausible data from sensors. But since they are capable of providing thousands of measurements per second, you can (and actually have to) write algorithms that throw away implausible values. This is usually done using a Bayesian minimum variance estimator (often implemented as a Kalman filter). This is exactly the kind of knowledge that makes a Bosch system a Bosch system and makes a car a reliable car. And it's why these high-end products are so expensive.
After filtering, you average out the values and get a (reasonably) reliable result.
I have often seen OBD logs from my old W203. It produces dozens of error messages every minute, but if they are found to be implausible, they never reach the cockpit and are just stored as an MRU list in the ECU memory only for debugging purposes.
With respect ot what
@PBD has experienced, I find it totally unacceptable that INEOS unleashes such an immature system on the customers and ruins its trust, which is the perfect way to shoot itself out of the market after the disastrous web launch and the totally insane billing and the just plain wrong built cars (wrong color, wrong engine ... unbelievable) let alone the completely incompetent "Customer Support".
The technician is of course right with his explanations, but what good is that? In the end, he's just the whipping boy who has to take the brunt of everything that management has screwed up.
What a shit.
Edit: refinements