As someone who held a French driving licence for over twenty years, I can confirm that this is completely accurate.
A couple of remarks on the Fiat Uno front. Firstly, a lot of sources estimate that at least one car in four on French roads is illegal because of registration, insurance, roadworthiness or driver licence issues. You wouldn't expect anybody involved in an RTA to get in contact with the police unless they were immobilised at the scene because the paperwork thing could get tedious. Secondly, there's no way anybody in Paris would go to a bodyshop to get repairs done after a fender bender. There's no point because some connard is going to smack into you again in the next couple of weeks anyway.
Also a comment on the hotel tips thing. A cousin of mine has long been an operations manager for a couple of very upmarket hotels, in a swish mountain resort in the winter and in a well-heeled seaside town in the summer. He's the man who can get you a last minute table for six in the most expensive restaurant in town, that kind of thing. And the amount of money he's made from tips from their very very loaded guests is frankly obscene; €500 for obtaining a dinner reservation and taking care of parking the Lamborghini is nothing unusual.