Its more to do with the shape of the bottle according to that article. Not really a summer fragrance so no need to take away in the warmer months but winter flying may cause problems.
It's under 100ml so should be fine
Just read it, absolutely ridiculous. Decant if you plan on taking abroad.
Don't take it in your hand luggage through customs, it's banned LOL https://www.express.co.uk/travel/articles/1046212/hand-luggage-rules-banned-items-cabin-baggage-aftershave-perfume
Great winter fragrance at a nice price for the EDP