This almost makes sense, but it is certainly not how Microsoft marketing did things. "Microsoft 365 Copilot app" is a suite of productivity apps, most well known for Word, Excel, and PowerPoint. It was formerly known as "Office". Microsoft 365 Copilot app includes Copilot as one of the apps.
This is all information taken from office.com, not some joke or exaggeration...
Can confirm - I'm looking at my Android phone now; the "Office Hub" app I knew as "Office" or "Microsoft 365" has, at some point, renamed itself to "M365 Copilot". To make things more obvious and less confusing, it's sitting right next to an app named "Copilot", which is their ChatGPT interface, and as far as I can tell, doesn't do anything copiloty with the Office suite.
Looking at the two side by side in an app manager, I see:
- Copilot - com.microsoft.copilot
- M365 Copilot - com.microsoft.office.officehubrow
And they both have identical icon, except the latter has a tiny black rectangle with tiny white "M365" label tucked in the corner.