Yes - I just saw this. I do understand why he does it - he is trying not to put them off at the first hurdle by presenting them with a style that is unfamiliar to them - he always seems to try and start off with something that they might know (never heard it myself, but there we are!). I am unsure as to whether this is wise really - in fact pop songs of that style are quite difficult to sing well because the rhythms are often quite offbeat, and there is a closed throat technique required which is actually very bad for voice production - I call it "vomit singing" as it uses the gagged throat that happens when you spew! Singing pop songs with a proper voice technique can often sound weedy and really very naff.
He is very weird in his song choices - when he introduced a "classical" song to the army wives, he chose a bit of plainchant - difficult to sing/tune, not instantly appealing, and intended for men!
He should get them going on some African chants - easy, fun and with a beat!
Yes - the words are surely drivel!
But, from my point of view, anything that gets people singing has to have a tick by it.