I find it noteworthy that SofS has taken interest in this publication. Together with things like the widespread adoption of Stonewall guidance on transgender matters across the public sector, and recent reversals at ministerial behest, it does rather suggest that unelected officials (maybe including uniformed ones!) have been taking such matters further than our elected representatives are comfortable with. The question of whether public services should lead, match, follow, or ignore changes in wider society is inherently a political one, and language which a senior civil servant in London might consider a new societal norm could well appear to others as unwelcome social engineering, so it is absolutely right for politicians to call the shots on these issues.
On a related note, I can't imagine SofS includes "he/him" in his email signature block, so it'd also be interesting to see if he takes a view on the fact that some leaders in his department continue to mandate strongly encourage the use of personal pronouns, having uncritically accepted the Stonewall guidance now in retreat elsewhere...