You pulled out,your fault simple as.
If he'd been doing 30 and hit that it would be bent beyond recognition fella as they really don't stand up well to a crash.
Also carpark being private land I'm amazed the filth bothered to come out plus getting CCTV won't be easy.
Sorry to sound doom and gloom but I've worked in the accident trade and have some experience in this field.
Fix out of your own pocket and expect to get a claim from his insurers.
Also filth cannot apportion any sort of blame from a crash and are only there to take details.