I guess this is probably a rhetorical question. But if you've been a victim of domestic abuse you may not want to read about it when you think you're just reading about a gov.uk web component, particularly if the abuse was recent and you're still traumatised by it. The author is just trying to be sensitive to that.

The language apology-in-advance does feel a bit like overkill though. I'd suggest a generous interpretation is that, given how things often work these days, they don't want people to get caught up in discussions about terminology and just want to focus on the tech.