To what extent is Single Concept on the C3B program these days?

I am aware of the restricted list that's supposed to be used at C3A (plus the fact that Single Bounce is on C2) but it's not clear to me whether it's kosher at C3B to call things which are not on the resticted C3A Single Concept list. You give a list of calls that might be used with Single Concept at C3 but you go on to say that the generalised Single Concept was voted off. Your esteemed viewpoint would be highly appreciated!