We just visited a few hours ago on February 27, 2024. We asked for a taxi at the reception of our hotel in Victoria, it was going to be a lot of money, 600 rupees just to get there so the receptionist called a friend who was willing to take us there for 400. It was a nice ride of 20 minutes once we got out of the afternoon traffic. When we got there we noticed that they now have a lot of signs, a gate, a schedule (they close at 5 pm!). There is an admission fee, we could pay by credit card. 100 Seychelles Rupees, which is just over $7 today, per person. Our driver was curious so he got in for free. There were two remnants of buildings to see (that could take at best 3 minutes), a statue, and a gorgeous bungalow were Queen Elizabeth took the tea in 1972 with magnificent views over Mahe island. Being just on the edge of Morne Seychellois National Park the few hundred meters that we had to walk we couldn't stop admiring the numerous trees. Plus the one guard that was on site was generous to show us a chameleon in a bush, the only one we saw here (and the first one that our driver saw in his life!). We chose not to make it to the cemetery.
Overall it was a nice 90 min trip, we managed to pay "only" 800 for the full return ride.
While the story might be impressive, I have a hard time imagining this as a full WHS anytime soon. This was a place to house 37 liberated African children slaves during a 13 year period (but after 3 years most of the kids where born of African parents who worked as laborers on various plantations). They learned psalm singing and some skills away from the town below (so they wouldn't be exposed to various illnesses). No idea what happened after it closed, but apparently the reason to be submitted to Unesco is that "the ruins remain an enduring witness of the altruistic concern that the burgeoning Anglican Church in Seychelles had for those who were victims of the slave trade."