No one is hiding scientific claims about climate change. It wouldn't be difficult to list scientific claims, but that's not his point. He is complaining that this organization is misrepresenting itself and the nature of its event in order to trick people into attending or appearing to support something they do not actually support.
He doesn't claim that climate deniers' arguments are incorrect because of something about their character or motives (that would be an ad hominem attack). He just doesn't want people to be deceived regarding this organization and its conference.
> More troubling is his claim that they are "weaponizing" reproducibility against climate change. Doesn't that raise a red flag?
No. Why should it raise a red flag? People can invoke the name of true and important criticisms in the defense of beliefs that are incorrect or harmful.
> I'm kind of a believer that people can think for themselves. Let anybody attend anything - if it's a science convention that isn't promoting science it seems like it's not going to get very far, no protesting required.
It seems like this person would agree with you: and that's why he has made an effort to inform people that (in his view) this conference is not promoting science. Moreover, how is this so-called "cancel culture" incompatible with people thinking for themselves? This person can write criticisms about an organization in a Twitter thread. Someone from that organization can write a WSJ article in response. People can and do choose what to believe. This Twitter poster (presumably) does not have the ability to unilaterally cancel anything, nor is there some cultural rule that if his tweets get a certain number of likes then the target of his criticism automatically gets cancelled.
