Really, this is how you do it:
We made a mistake. It’s important as a website that readers can trust that we are up front when this happens, and willing to admit to our failings, and promise to address them. And as recently as last week, Rock, Paper, Shotgun let a woman write an article. We would like to apologise to our readers for any offence caused.
Well, it’s how you do it when you don’t mean a word of it, anyway.