"Well, we didn't tell pilots that MCAS exists, which means we didn't tell them that AoA is hooked up to it, which means that AoA failure isn't relevant to their

"Well, we didn't tell pilots that MCAS exists, which means we didn't tell them that AoA is hooked up to it, which means that AoA failure isn't relevant to their decision making, so there's no safety threat from not communicating it." (In case there's doubt: I am not joking, I think this is seriously the argument.)