I have updated and published the product here:

Restricted Forums By Post Count

:)

Does this mod or is there a mod that restricts users from even seeing a forum or sub-forum based on either being logged in or post count?

You could set that up within vB without installing anything new. You can create a usergroup that has access to that particular forum and if you want you can make it where no other usergroups other than staff can see or post in that forum. As for post count when you create the usergroup create a usergroup promotion that will give access after they reach the post count amount. As for being logged in you can restrict forums so they are not seen when someone is logged out.