My understanding is these H 1 workers are hired for the “season” ie the winter months when all the rich folks who are members of the club want to be there. Three months of the year. In other words, temporary workers. Hard to get good Americans for these jobs on a temp basis.
I did read a story about Trump wanting to make his long time butler the concierge of this place. The butler refused the job, saying he just wanted to be Trump’s butler for the rest of his life.
Staffing that particular property is not equivalent to hiring a cleaning crew for a Motel 6.
I imagine it would be difficult to recruit the caliber of employee needed from local hospitality workers, who would almost certainly NOT even apply for a seasonal position, given their proven ability to command premium wages for full time positions.