If this request is correct then it's hard to see the hearing going ahead in November this year unless it's not actually germane to it.
To have all mails, texts, WhatsApps etc relating to City from every club that has been in the PL since 2009 produced to the IC, the club or both is in itself a huge task. That information will then need to be forensically examined to determine if whatever is being looked for is proven or not. It's something you would have thought would have been demanded at the outset.