Four Seasons said their spa was open when I contacted them. That seemed fairly informative to me.

If you go to any developing country (or even established one!), there is the risk of a change in regulation at any time.

I don't think we'll find a lot of published legal analysis of this. If someone is enroute to the Maldives at present, they're already pregnant, so is what it is. If someone is thinking of booking, it might make sense go hold off a few days to see how this sorts out. I doubt it will be in limbo for long.