I went ahead and pulled the trigger. the roads are now public. 
While driving through here there are road signs that direct "through traffic" which sounds pretty public to me. there's a ford dealership right on the corner, those aren't usually on private roads cause they want to be seen.

anyway, if somebody else comes along and finds this information to be false, they can leave another note here or make the roads private again themselves. it took, like, 5 minutes, but I'm fairly confident these roads are public.