Colour me sceptical of the in depth knowledge of this poster, since he insists on making nitpicks about orthography, without providing any substantive comments

Colour me sceptical of the in depth knowledge of this poster, since he insists on making nitpicks about orthography, without providing any substantive comments of his own. The leads me to believe that the poster isn't well-versed enough in the article to be able to make comments such as these.