Having played the course in October, this isn't too surprising. Based on a quick google search, it seems like their website to book tee times still isn't up. There were no kitchen appliances or anything at all in the pro shop/snack bar area when I was there. I was told it was coming in by December or January for the summer season, but who knows? They did have nice rental sets though, brand new bridgestones through the bag.
In my mind, this course isn't destined to be a failure even though golf tourism isn't that big in Brazil. At ~$250 per round, I doubt they need a full tee sheet to survive, but certainly more than the 9 golfers where were there the day I was. The few people I talked to in the clubhouse knew nothing about golf, so that probably needs to change if they want to create an environment where golfers enjoy it.
That being said, there are hundreds of hotels in Rio. Every one of them has a list of tours they can book for their guests. If they got a "Olympic Golf Experience" Tour on the brochures that all of them hand out, I imagine they can get some people to show. Provide transportation, charge $300 and make it a day of golf and I would be surprised if this wouldn't fill a few tee times a day. Maybe this isn't enough to keep the course alive, but it would drive some traffic that is currently not there.