It's not like the article is indirectly related to the subject of the conference. It is critical of the government, but not in the "human rights abuses of this administration threaten us all" way (though even that seems reasonable to discuss).

Is it your position that if an article is critical of a world government it must not be discussed at a scientific conference? Or even "you should expect to get ejected from a conference if you criticize the host government"? Because believe it or not, that's not been a problem in the USA prior to Trump. And it runs contrary to how science should work.