What “deniers” deny is that the warmists/changeists have any kind of acceptable model to work with. That their concerns have any deeper basis than sheer worry.
in turn, we are denied access to their databases, denied questioning their conclusions, and denied media access, research facilities and funding we all provide to point out the flaws in the 'research'. If we obtain independent funding (of the public trough), we are denied credibility because of the source of those funds, even as those who provide public funding have a possible pecuniary motive for maintaining both a lock on that funding and any discussion. Even the term "denier" is straight out of Alinsky, and hardly a term of scientific debate. It is, instead a social manipulator to isolate those of us who know bullshit when we see it.