Wow. Lots to unpack there. However, I will say that your constant use of the term "climate denial movement" is rather telling. Why argue on merits when labeling your opposition is much faster and more effective. Amirite? My suggestion on this front would be using this invective a tad less often while accusing others of "spreading propaganda". Just an FYI.
As to Dr Mann, being cited and published is what makes him an authority? Back when science was actually...your know...concerned with science I could see that being true. These days unfortunately "publish or perish" is the rule of the day. Add in the grant money needed to continue actually working in the profession, and there is little wonder why Mann and his ilk are so revered within the echo chamber that is the scientific community these days. Many papers these days, including the one cited in another thread regarding oceans warming, are nothing more than a pile-on to gets one's name on something to keep the grant money flowing. There is often an inverse relationship between the number of names on the paper and the quality of the work. That particular one being a prime example.
You say that the "climate denial movement" is shrinking. Not entirely sure where you get that idea. Seems quite a few countries throughout the world are heading away from your way of thinking. Perhaps I am wrong. What do I know? Whether there are a billion people or just one, being correct has nothing to do with the number of people who "believe" something to be true. You use the term propaganda. I would postulate that the propaganda has been on your side for decades. Simply substitute the term "climate alarmist movement" for "climate denial movement" and it is quite applicable to most of your above statement. Except for the scientific peer review part. Which, again, tough to penetrate an echo chamber that is so beholden to the money that flows only in one direction. Same with media. The more sensational the better. So alarmism wins every time. Gets more clicks.
Science is not afraid of contrary views. It welcomes it. It is always pushing what is perceived to be accurate. If it didn't we'd all still be eugenicists. Wouldn't we?