I imagine he took the opportunity to take advantage of the mistake in being given a talk. because it sounds like he was 'witnessing' for his new beliefs.
If JWs have it wrong -- he too was promoting the equally implausible scripture of Rom 10;13. How simplistic to say all you have to do to be saved is, "Call on the name of Jesus"? Taking the Bible literally, is a mug's game.
These words are among those which must have made converts to Christianity so easy. It was the lure of easy salvation through mention of a 'magic' name. This simple formula is naive, there is not one piece of evidence to back it up but what bait for simple souls to believe!
In two thousand years does any one have the name of someone who has definitely been 'saved' through calling on Jesus?
Is "salvation" useful, or even desirable?
Should we listen to the words of the ex JW speaker on the platform because he now has the right interpretation on the Bible?