Got it wrong, then got it right. crucially tthough, he got it right at the correct time and didn't do what he's done in the past and waited for things to go wrong before changing it.
Hopefully that's the end of 3 at the back, it doesn't work and leaves us wide open.
Im 99.9% sure 3 at the back is not what he was referring to when he said he got it wrong and it was terrible.