I think he is referring to the former,Pied Piper, but Mick can answer for himself.
Sadly, there are a considerable number of people who have got Gaelic as their first language but don't value it. I know quite a few people who, when spoken to in Gaelic, will always reply in English.
I would say that it is their choice and right, not to be regarded as Gaels. The corolarry of this is that people with an appropriate desire, understanding and attitude can, in fact, become Gaels. To suggest otherwise would have implications of race or of a separate people.