In case anyone was on the fence about the science behind gender ideology, the National Hockey League has decided to lend its expertise about human biology to the discussion.

On Tuesday, the NHL announced that it was “proud to support” the “first tournament comprised entirely of transgender and nonbinary players.” As many people pointed out, this just means that the NHL has discovered co-ed hockey. But in response to one user who claimed that this was just men playing on women’s teams, the NHL devolved into full scientific illiteracy. “Trans women are women,” the league tweeted. “Trans men are men. Nonbinary identity is real.”