It does not say anywhere that this is a closed jam, but the brief description does currently say the following:
<quote>
You'll be tasked to create a JAM based around or in Hell. The
class will then vote on which of the JAMS submitted will be the best. Good luck and have fun!
</quote>
This makes me wonder, who are the members of this "class". Sounds a bit like it's a jam organised by some game dev school by and/or for the students of that school. It could also be a particular social class (like the proletariate) or an MMORPG class (like a Shaman), but some how I doubt thath.