That's journalistic nonsense from this writer in the Mirror. There is no way you could have judged Andy's opinions on the matter from the Marr interview.
I doubt that Andy will actually even have a vote, as his home is in Surrey, isn't it? You can't be on the electoral register in more than one place. I'm sure he does have an opinion - most Scots do - but he's wise to keep his own counsel here.
In the interview Andy said he'd been playing around the world since the age of 12 and I think he moved away from Dunblane over to Spain when he was 16. 10 years ago. Yes he is a Scot by birth, and a Brit. If I were to do something of acclaim right now, I wouldn't go back to Charlton in South-East London to be congratulated. There must be a dividing line between place of birth and place of residence, but at what stage ?? Bob Hope, Andrew Strauss, Cliff Richard, Bradley Wiggins, Cary Grant and many others.