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I was actually going to respond with a lot more than me until I read your edit!
I'm assuming anyone moving out of London to Bath probably has decent money coming in. The commute wouldn't have been a surprise cost in the move but I'm also assuming that there is some amount of WFH too.
My main point was this example used to show people regretted leaving the big smoke for the countryside was shit as they'd picked someone who moved to another city with good transport links and plenty of posh shops and expensive coffee.
Especially when you realise it's an hour and a half to Paddington from Bath with its main line train station. Bath is not at all "the countryside" it's just a city that's smaller than London.