That IS him.
He is a pest. He just appears in the garden, doesn't ring the door bell or anything like that.
My wife had the misfortune to encounter his friendly hands.
My advice - show no interest in the fish, do not enter into any conversation with him, escort him from your premises as quickly as possible, show no signs of friendliness to him at all, make it clear you don't want him to come again. Be rude if necessary.
Do not leave him alone with any ladies at all.