Anything is possible, but ...
a) this was a 74 plate press car so not brand new & straight off the production line (i.e. build issue) or old enough for wear & tear to be significant
b) charging is relatively simple & straightforward, and wouldn't the car have given an alert/warning if reverting to a low charge rate for some reason?
c) the ID. Buzz is 3 years old now so should be pretty well sorted (it is a £60k plus vehicle, even after recent price cuts)
d) given that it was being used for an article wouldn't VW have done their utmost to replace it with another one if there was any question of a vehicle fault?
I've read other similar articles about the realities of rapid charging, and
@SmartAmg (EV driver) said this was nothing new and all stuff that was already known