I try not to address Stalkus, but that post is openly racist and worthy of a Nazi eugenisist.
He suggests - no, openly says that people's nationality relies upon their ethnicity. Does he apply this to all races, or just Jews ?

It's a false argument based on a plain lie because there's no such thing as an English ,( or Welsh), ethnicity, and it shows that there are some seriously sinister characters lurking in the Labour Party.