Why shouldn't Office365 be counted in cloud revenue? "Cloud Revenue" doesn't exclusive mean IaaS or PaaS.
There's similarities, but key differences that you can easily look up to better understand. Hence part of why most aren't huge fans of including O365 to claim Azure's bigger than AWS.
If the claim is that Microsoft's cloud revenue is bigger than Amazon's, I would assume that includes Office365. Office365 isn't just Word and Excel on the desktop, it's Outlook, Dynamics CRM, Sharepoint, Teams, etc.
I doubt it, but that’s just speculation without anything to back it up.
So any concrete data would be interesting.
Even if the bulk of the Office365 ecals they're selling are for the lowest tier offering that still includes Outlook and Onedrive which a lot of organizations use fairly heavily.