His point wasn't that going round the wicket confused the batsman.
He said that if you plan on going round the wicket then first bowl a delivery or two from really wide on the crease over the wicket to get the batsman used to the ball coming from that wide angle. Then when you switch to coming around the wicket bowl the first ball from really wide on the crease to really exaggerate the change in angle. Don't bowl from next to the stumps over the wicket then close to the stumps when you come round.
I understood what he meant, but its nonsense. A bowler can bowl from square leg if he wants, it makes no difference to a competent batsman. There is no such thing as a "change in angle". Every ball comes straight from the bowler's hand to the batsman. There is no angle. Its not French cricket.