So the first report said people with liquid money chose to move it out of the UK. This report says actually anyone with a largish paid off house in a good area should be counted, and as they didn't sell their house and move, there's no problem.
I appreciate that they point out the biases of the first article, but I still find the 'liquid millionaire' a more interesting stat. The Times also reported that the UK collected less tax revenue after trying to tax the ultra rich more [0][1].
So at the moment I'd say both people are stating their side too strongly and the truth is maybe somewhere in the middle but I'm still leaning towards 'rich people are leaving the UK if they can' based on what I've read.
[0] https://www.thetimes.com/uk/politics/article/capital-gains-t... [1] https://archive.ph/qXcUc