His supporters help him get elected but what pushed Trump over the edge to win a landslide electoral college victory was his support for populist policies in key swing states which are things that Hannity doesn't endorse over traditional conservative policies. If the coalition that got Trump elected was a solid conservative one in states that are usually conservative then maybe conservatives like Hannity might have played a larger role but Trump appealed to people beyond that and won because of it.
You are ignoring what I've been writing so I'll quote it from Manufacturing Consent itself.
Koppel ran a show for over 20 years that was guilty of this. Nightline and shows like it functioned to support the partisan consensus in the country and manipulated people into buying into it without thinking there might be something outside of it. Hannity doesn't brand himself as anything other than what he is, a conservative commentator.As we have stressed throughout this book, the U.S. media do not function in the manner of the propaganda system of a totalitarian state. Rather, they permit-indeed, encourage-spirited debate, criticism, and dissent, as long as these remain faithfully within the system of presuppositions and principles that constitute an elite consensus, a system so powerful as to be internalized largely without awareness.
You are ignoring other key factors. Hannity's numbers are much lower than what Koppel pulled as relative to the total population of the country. For the large reason that there are more than 3 news channels in 2017 compared to the 80s and people don't watch cable TV as much anymore. People aren't drooling buffoons who sit on the couch and believe whatever they see is attempting to be impartial and all inclusive unless they are told otherwise and can't get information in any other way so they assume it doesn't exist. Hannity's show appeals to people who already agree with him before they watch it. The "lies" (I put that in quotes because I don't watch Hannity so I don't know what he tells them) are not objectively more harmful simply because they are more extreme, the issue is more complicated than you are making it seem.