So Vader is an all powerful empath who can sense all kinds of shit over lightyears but he can be immediately thwarted if someone lied to him 20 years ago?
Not the take you think it is. The fact there was zero hesitation means he’s either an absolute idiot who doesn’t acknowledge personal feelings/vibes/hunches (which doesn’t match with anything we’ve ever seen from Anakin) or his powers to sense other peoples presence is greatly over exaggerated.