We don't hear a tenth of what gets said on the field. Mike Haysman said in one of his recent articles that, as a commentator, he gets to hear the comments via the stump mike - and it doesn't appeal to him at all. The players still work on the understanding that most of what they say on the field stays there, the public never get to hear it.
With that said, it's still odd that Ryano thinks comments shouldn't be made off the field. What about Warner saying that Trott "looked weak" during the Ashes, Broad saying that England "felt like silent assassins" after the first day at the Gabba, Warner saying that Vern was dropped in Adelaide last year, not injured. And Warner (again) implying that AB was roughing up the ball with his gloves to aid reverse swing in PE. Aussies certainly aren't shy to continue comments to the media once they've left the field, they can't complain if Virat does the same now.