Sounds like your former EC member is on a revenge trip. The Owners Corporation (all owners) is liable for any damage caused by faulty common property so, for instance, you might have to pay the excess on the owner's insurance. If the car insurer want's more, they'll ask for it. As far as personal liability goes, your EC should have insurance, just in case you make a mistake. If you don't, get some.
Personal liability only comes into it when you have been told there is a problem and have chosen to wilfully ignore it even though you knew it might impact on owners, residents or anyone else associated with the building. That could be construed as wilfull negligence whioch probably wouldn't be covered by your insurance.
In other words, unless you knew this was going to happen to the ex-EC member's car, you're probably covered … and it spunds like you are well shot of this bully.