Mark Simpsons has made a career out of criticising various facets of the gay community, so he really shouldn't be taken seriously, and especially so in this case since there have been numerous scientific studies into the existence of gaydar that have concluded that it does, in fact, exist.
Which makes the general theme of that article demonstratably and unambiguously wrong.
To be fair, I'm Gay and my Gaydar is generally sh!t! Although Tom Daley sets mine off like a rave in Ibiza!!! So that mean he's probably Mr Butch McMacho of Heteroville!