The bollard had been knocked down already by someone else and was by a wall on the pavement .
What's happened is that the driver has drvien on the circular bit that remains on the road , where the bollard would normally sit on - which slightly protrudes above the level of the road surface .
There is no damage to the car , because it's the tyre that has driven on the bit in question
IMO, as he has contacted the insurance provider stating that there is "damage" to the car, even if only a tyre being damaged - due to inattention as to where they were driving, then the insurer would be correct in considering this to be an RTA, under the T&C's of his cover.
If as you say, there's no damage either to the car/tyre, then why report to insurer, I'd get in contact with your county Council roads department to request them to repair it, though.
The driver knows that he is probably being silly , in thinking that the event needed reporting to his insurer .
It was a case of claryfing what constitutes an accident , for car insurance purposes .
Just needed confirmation that it is not an accident and therefore not required to be made known / notified to insurer