Ah, yep - so this isn't an AI answer, just a summarisation of the top response. I clicked on the "Quick Answer" link, and this was returned:

Looks better! Still, the default Google experience is a bit nicer, in that the front-and-centre answer is in the right units.

This now seems like a much more difficult problem of prioritising locale-relevant results, if the knowledge widget is picking the first result... 🙁 Thanks for the response!