Eh sorry but... Brexit vote was when, 2016? From then on it was all over the news. So up until 2021 this dude thought nothing of it, as Brit living in an EU country?
"They should have told me", yeah man, sorry, but you are an adult with at least half a brain to count 2 and 2 together. It's your own fault you are in this mess and having a newspaper write an angry article about it should not change anything.
Edit: Direct quote: "...and I had zero idea that Brexit meant I had to apply to remain in the country again" Seriously?
Another one: "Although Solomons pays a mortgage and has had a family home in Sweden for more than the five years that would have made him a permanent resident of the country..." He could have applied for permanent residence too, it just gets weirder as you keep reading it.