I read this as the editor, probably with input from editorial board (which includes Esther Crawley), seeing this as a convenient face-saving way of not upsetting any of their contributors. An editorial mistake is just a slight oversight. It does not put any pressure on any authors or on any referees who might have provided muddled opinions - or indeed suggested an idea to the authors that on reflection wasn't so hot.
It's the same essentially as with Crawley's LP study--the journal has twisted itself into pretzels to not call out the researchers. It is really disgraceful. I'm putting together another letter to the journal and Dr Godlee and hopefully Jo and the others will join me again.