You're not thinking like a woke intersectional marxist performing Maoist entryism on the hobby. (i.e., "All institutions must be retooled to serve the revolution or burned to the bedrock so the enemies of progress can never use them again.")
"They" means the new Eldar Corsair is "nonbinary," a favored made up thing on the woke left.
They just haven't had a chance to reveal it epically in some novella to own the chuds so their friends on /tg/ and /r/sigmarxism and x can smugly post it and try and rub their colonization of the hobby in the 40k community's faces. "Warhammer is for Everyone but that really means it's NOT FOR YOU, Chud!"
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Like this post when the FemStodes thing was crashing into the community.
Best case scenario will be it'll be some halfassed storyline about how some soul gem was used on successive people of either gender until the resultant persona no longer had a gender, or how "The Captain is an Idea, and Ideas are Genderless." Worst case will be us getting some lecture in how the race of aliens who literally raped children to death until a god of rape fucked a hole in reality visible from across the galaxy and destroyed 99% of the entire Alien race in the process is TOTALLY PROGRESSIVE AND AGREES WITH CALIFORNIA POLITICS, CHUD.