It's a lot of parking for sure, but I think most of the condo residents, hotel guests, and members of the a 100k sq ft private club here will be driving to/from this location. It's
not a very pedestrian friendly area (one side
doesn't even have sidewalks) and I can't imagine a lot of people from the
adjacent neighborhoods walking here as well. Given the $5 billion ultra luxury branding of this project, I suspect the vast majority of the clientele isn't riding the bus, and this project is a good 15-20 min walk from the future D Line stations at Century City/Constellation and Wilshire/Rodeo. If they are members of the club, they will likely drive there in their luxury cars.
Edit: It looks like they do plan to create new bike lanes and walkways that better integrate the publicly accessible gardens and shops with the surrounding neighborhoods. I'm not sure how many people routinely walk or bike in this area, but at least they are recognizing a need to make improvements. Although by providing 1900 parking spaces, I'm guessing they still anticipate the majority of people to be accessing this site by private vehicle.