A strange comment of Beyle's post

An anonymous guy commented

AnonymousMay 24, 2012 6:00 PM

Thank you for this post about a very important and unduly neglected singer. Having apparently recorded over 300 sides during his somewhat short career he was obviously regraded very highly by the recording world in France during his lifetime. Its also very interesting that according to Ward Marston (I verified this through correspondence with Ward) Beyle was biracial - part Black. You can see this pretty clearly in his photos but its something never mentioned in any of his biographical material. He must be the only Black or partially black opera singer to achieve great success in opera prior to the 1950s besides the Pirogovs in Russia.

KBR

Strange this guy writes that his name is really KBR (name of the company Kellogg Brown & Root) and that he wrote to Marston to confirm.  Strange he did not see that Arakelyan sells mp3s from copyrighted Marston's CD.
Also what does the Pirogov's brothers reference mean here.