I think it's the direct opposite: A huge part of "managing up" is making your your boss knows what's going on enough to help them make a wrong decision due to being unaware of details you and your reports are aware of. If you're scared of contradicting or correcting them you can't do that.

A huge common mistake for anyone with a boss - at ANY level, IC or management, is assuming their boss knows everything that they know + more things. The intersection of what you know + they know is probably smaller than you think. And so being able to recognize what they will NEED to know in the near future is a valuable skill.