I get that but it doesn't even make sense in terms of the dream logic. Bill basically has two "confession" scenes - one with Zeigler and one with his wife and seemingly doesn't mention the stuff at the costume shop in either. However he was open to confess to Zeigler that he knew about the dead woman. This seems contradictory. I think there are two possibilities 1) it was unfinished or 2) it was intentionally left out. Both of which are very interesting.
Well they are supposed to be confessions yet he does not confess the worst part of what he witnessed. IIRC he literally says "I'll tell you everything" then proceeds to leave things out. Somewhat contradictory.
I don't take them that way, Ziggler is certainly not being forthcoming with Bill. I'm not sure why you'd expect Bill to be honest about everything, I don't think that's the point of the movie at all, no less so that it doesn't make sense because he wasn't honest