Since when is ‘too shut’ a fault?

On the lately concluded All England, there was a fault known as within the Males Singles Ultimate. Umpire is heard to inform participant he faulted “… too shut”
The video clip of that rally is right here —

Since when is {that a} fault? The legal guidelines doesn’t point out any such factor.

Did the umpire err in communication?
Was there a fault? If that’s the case, who was at fault?

 

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