Once again your whole argument is based on the flimsy premise that Ni doesn't like details. HINT: ENTJs use functions other than Ni, and the extroverted Te and Se functions are the only ones that are visible to others. Ni might not like details, but Te and Se do, and those are the functions others actually see.
The question wasn't, "Do ENTJs think they're micromanaging?" The question was, "Do ENTJs come off as micromanagers to others?" Te+Se can definitely give that impression, regardless of Ni's quiet lack of interest in detail.
Other than that, you're operating on oversimplified definitions of N/S. The idea that "Ss like detail and Ns don't" is an elementary rule of thumb intended to simplify the concept for people who don't understand functions.
In other words, an ENTJ in the process of interacting with the outer world is going to be in Te and/or Se mode (which can and does focus on details in many situations!); Ni comes later when it's time for self-reflection.
Read up on Te--it insists on accuracy and control to such a degree that, even if you don't think you're focusing on trivial details, it often comes off that way to others. Remember that, as extroverted functions, Te and Se are far more evident to others in their interactions with you--we can't see your Ni at work, so even if you don't mean to, you can frequently appear to be micromanaging.