Well, that article is posted on an Orthodox website, so I don't find it surprising that they would be sure to point out that he went through an Orthodox conversion.
If a convert had been writing the same article, s/he would have probably made no mention of what denomination he is.
But I do like what the convert actually said: “Instead of focusing on the adjective – Reconstructionist, Reform, Conservative, Orthodox – as important as those differences can be, I try to emphasize the noun – Jew,” he explains. “We need to remain one united people, even if we are divided in our opinions.”