I wasn’t picking on you Whale, I think you are fab, bless your blowhole. And the advice you have given is spot-on as usual.
It’s just one of the ironies of our over-engineered life, someone comes in, hacks up the property to install something, and then can make a fuss if you touch their stuff. Kafka would have a field day.
That said – I think there is a difference between someone’s car parked on the property or items left on the common property – in those cases they are not installed with consequential damage to the common property, and are capable of simple removal.