Piotrus and Volunteer Marek, among others, are Wikipedians mentioned in the above article. I contacted those two individuals because I felt it was fair for them to be aware that people were discussing them in an off wiki venue. Anyways, Piotrus said that I could share their response:
Thank you for the information, but I am unsure how to find that particular discussion. I am aware of the general context (the article), which is being discussed in some places on Wikipedia. My quick comment on it is that this article contains numerous errors and inaccuracies (mixed with an occasional fair point or critique, nothing is white and black), and seems significantly based on data provided to the researches by a very tainted source, i.e. globally banned user Icewhiz, who was first topic banned the Polish-Jewish topic area by ArbCom, then site banned from Wikimedia Projects for harassment of myself, Volunteer Marek and others. You are welcome to post my above message there through a direct quote.