Since when is this a thing?
I'm very interested in learning this language now that there's a way to. But there is no way this was supposed to release. It along with Hawaiian doesn't have much if any sound and it didn't even have an entry on the add course page thing until now. I hope they don't have to take it down to add more so people can get started and then keep going from there.
Most people believe that it was a glitch, especially since Duolingo hasn't posted anything about releasing the courses on their social media.
The course having no sound reminds me of the situation with Swahili, which has no sound despite the contributors saying they've recorded anything.
This also reminds me of when they accidentally released Hindi, but still kept their language level. Could be a similar situation.