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It's a reference to an early 90s British sitcom (that I never thought I'd see on HN)

I'd suspect the reference was at least partly prompted by the recently released prequel (it was broadcast 2 days ago):

Keeping Up Appearances was better than Young Hyacinth IMO. Here's an intro to Mrs Bucket:

Nope. Never heard of it. Though quite cool.

The reference came from being about to write 'people keeping up appearances', then remembering the show.

Fair enough. The prequel timing was just a coincidence then.