I still maintain that it wasn't a real iceberg - the PR story is there to get people talking. Not only do you have the logistic headache of getting it to its destination, the amount of movement and temperature fluctuation it would be exposed to would render it structurally unstable, you wouldn't be able to vouch for its integrity - and you cannot have something like that so close to a crowd of people.
I'm sure there are individuals who'd consider being crushed to death by an iceberg at a Chanel show some kind of fitting end, but in real life, there are going to be regulations and insurance restrictions.
Perhaps it's water transported from whatever region it was, which has then been refrozen and sculpted to this particular design in a workshop nearby - and that's how they can technically describe it as an 'iceberg from wherever'. We're given the idea of an iceberg travelling in majesty across the sea and land, when really, it arrived in the form of 4,000 canisters and got put together by workmen who usually spend their time doing skating rink maintenance.