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What makes you think it's a government blog? Looks like a personal blog to me.

Sorry, I'm not totally sure why I made that assumption. I thought I'd spotted a '.gov' domain, but clearly it's not. I guess some of the writing also implies it (e.g. "Last year [...], we launched the GOV.UK Design System’s Exit this Page component") but, of course, this could just be a contractor.

I _think_ they're an employee of the gov.uk design service?

It's a personal blog btw. And there is absolutely no way a UK Gov blog would call Google bastards.

I didn't read it as a dig at Google specifically, but I accept your general point is totally correct.

The individual has impunity of the department has impunity?

Not sure if you know this, but it might be of interest: in the UK speech, within the House of Commons (maybe the Lords too? I'm unsure) is specifically protected from defamation actions. An MP could stand up and say "Mr Smith murders kittens in his spare time" and Mr Smith would have no ability to sue. However, this does not apply to MPs outside of parliament.