Hey, I like it! Appreciation, not suspicion. Best non-DP version I have ever heard. Also like the way they slooooooow down the chorus. In that arrangement the riff sounds even Celtic (and Ritchie, for all his love of continental folk music, disdains Celtic music, "because the melody lines are always the same").
The origins of the Burn riff were rather non-Celtic indeed. Ritchie wasn't aware of it, but classically trained Jon Lord immediately caught him out when they first rehearsed it at Clearwell Castle. "Oh, that's Gershwin's Fascinating Rhythm you're playing!".
I don't have issues with Deep Purple interpretations, the more radical a departure from the original, the better.
(I know, Rolf Harris fell from grace hard, but the arrangement is still good.)
It's only when bands "ape" the Purple sound and the Purple arrangements that it quickly becomes pedestrian.