The article is however quite bad at distinguishing between:
- British nationals moving their place of residence from the UK to the EU
- British nationals already resident in the EU changing their nationality so they can stay there after free movement is taken away from them
And doesn't mention the third category: EU nationals normally resident in the UK deciding to return, and whether being deemed ineligable for "settled status" or indefinite leave to remain is a factor in that.
People who I have spoken to about this tend to be pragmatic; even a damaged UK provides more economic and social freedom than many parts of eastern Europe. Especially compared to rapidly de-liberalising Poland. However, we've yet to see how badly the government copes with the end of the transition period.