When you say Dr Mackereth "took one for the team", to which team are you referring, LookTwoFingers?
Because from reading the article, the "team" to which the doctor belongs is that of homophobic and sexist fundamentalist religion. There's nothing gender critical about his beliefs. He thinks gender is real. But his thinking is muddled.
He believes that once same-sex marriage became legal in 2014, attention was turned to the next gender-related issue.
Gay marriage is not gender related. Like most people these days, he uses gender and sex as synonyms which is a bit depressing in a doctor. He should know better.
Still he's lost the chance to work for the DWP which, if he really holds actual Christian values, is a good thing from his point of view as there's nothing either compassionate or merciful about the work he'd be asked to do by the department.