I call BS on the whole thing.
The car was an E53 X5.
Not only is there no such thing as a transmission that locks-out neutral at any speed but also the automatic transmissions of that generation were still "physical", meaning one could physically move the gear selector into neutral. So that throws out the "electronics glitching" theory.
And then there's the key. E53 X5s still used physical keys in the ignition,
where the user would insert the key and turn clockwise to start. The opposite, counter-clockwise motion would've shut the engine off.
The guy had 30+ minutes. Even in a "panic" situation, there were a number of solutions available and that's before we discuss the braking options.
There's simply no excuse. The guy is an idiot.