No firsthand knowledge.
But, I’ve been involved in similar. The vessels they feature (website) would be okay for flopping in and snorkeling, nothing more. So, you get SCUBA outings from an outside vendor. I’m sure you knew that.
In my experience, I was hired to fly for arrival ahead of a family’s private yacht and arrange charter for diving services. To make the outings more expeditious, I would have the pre-outfitted dive boats come alongside and transfer my guests seamlessly. Otherwise there would have been a lot of schlepping to and fro to the dive ops island base. My method costs more but would consume 3-5 hours to get a two tank boat ride.
I’m pretty sure Tradewinds will go with the to-and-fro method. It will be an 8 hour thing off of your yacht. The alternate I described providing took my professional level skills to make happen. My clients wanted and could afford what is truly concierge level service, a term that nowadays gets over-used to the point of meaninglessness.
I would not look at this as a dive vacation in any manner, it’s a vacation where you did a couple of dives. My people got an option of 11 dives in their week.
Just my guess from previous experience.