No. The Manx Radio advert is spoken by the greatest living Manxmen, in the world, ever, John 'Dog' dog dog Callister. I know that because he came on straight away to tell everybody. And that is how he speaks all the time he says. And that is true Manx.
And as Chris Williams said, he is the Manx Bard - Official.
Well as far as I am concerned the advert is like a Gaiety Theatre Isle of Man fringe Young Farmers pantomime act of a yokel Manx Accent, wth an over-abundance of 'Yessirs' and plenty of 'Fellas' (a recent addition to the 'Manx' vocabulary btw).
By chris' yessa, this Islan' is gettin' desperate for it's identity by the minute. Fella'.