So long as you know where to look and can quickly check, not remembering is OK. If your boss wants you to remember everything of the top of your head, he's being a knobhead.
This useless and obnoxious criticism actually ties into TFA a bit: when GP was writing for this audience, they wrote in a way that wasn't overly precise, but specific enough that we'd understand their point.
This comment actually ties into the GP's point about how when you get further from the context, not being overly precise will lead us to eventually not understanding that part of the point.