It's like something off an episode of Arrested Development.
It's one of two reasons. One, they said the presser would be at the Four Seasons hotel, but it was unavailable so they booked another Four Seasons to save face. But that doesn't make sense as you'd just re-arrange it; scheduling conflicts happen all the time.
The second possible reason, and honestly has to be the only one, is that his team were told to "book the Four Seasons", they did, but the landscaping firm, and by the time they realised the error it was too late and went with it.
There's absolutely no way it was done on purpose. It's one of the greatest cock-ups in human history.