He is a good example of what is wrong with today's philosophy of science. I have explained some of his erroneous thinking several times on this blog.
Nathan Cofnas wrote Research on group differences in intelligence: A defense of free inquiry, and it was published in a respected journal.
They argue as follows.
First, Pigliucci and his coauthors argue that it is an error to even talk about human races because no races were ever completely pure, isolated, and phylogenetically distinct for an evolutionarily prolonged time. This is a strawman attack, because neither Cofnas nor anyone else ever said that they were.
Second, they say that Cofnas is the one making the strawman attack, because "Allegedly, Cofnas felt compelled ... He seems to think ... perspective is significantly out of tune". In other words, they are doing some mindreading, and criticizing what is in Cofnas's head instead of what is in his paper.
Third, they attack the editors for publishing a paper that undermines leftist policy goals.
They demanded, and ultimately pressured the journal to accept, publication of their criticisms without any rebuttal from Cofnas. The rationale was that since the whole point of the criticism is to censor Cofnas for discussing a taboo subject, it would be inappropriate to let him respond.
This while thing is just another example of how leftist creeps have corrupted academia. Pigliucci knows enough biology to know that races are scientifically meaningful. After all, you can send your spit to a DNA lab, and it will tell you what race you are. Many scholars have apparently decided that they can insulate themselves from accusations of racism if they pretend to subscribe to a fiction that races do not exist.
It will not work. The academic race scholars of today say that race is a social construct, but still say that all Whites are inherently and immutably racist. That argument is being used to say White people should pay reparations to Black people, and we even have a Presidential candidate whose web site endorses appointing a commission to make such recommendations.
The biggest selling academic racism book of the last several years has been White Fragility. It argues that the worst racists of all are Whites like Pigliucci who deny the reality of race. I am not endorsing that opinion, but pointing that he cannot avoid racism accusations by denying the reality of race.