It's the only dive shop on Lifou. I drove around the entire island and didn't see another dive shop. Yes, you do need a car to travel on the island, as it is very large. The dive shop is inside the Easo tribu, specifically but a few steps inside the Gite Benoit Bonua and on the right of the main gravel entrance. You can think of a Gite as a hostel, where you bring your bedding, although there is a restaurant on site. Be aware that in New Caledonia, you have limited service, so don't expect 24/7 shops. To my knowledge, Anabella was still the owner and she did reply to my inquiries last year. Shop provided steel tanks, 5mm Mares wetsuits, Mares BCDs and Mares regulators. My MR12 was paired with a Scubapro G250. Was pleasantly shocked!
The diving is fantastic by the way. I saw Tunas but a few hundred meters from shore and I was in 30 meters of water just a few hundred meters from shore. The following clip (a bit long, sorry) should give you an idea of the diving on Lifou, which is far far far far better than the diving around Noumea.