I think he's talking about Microsoft Copilot 365, not the coding assistant.
Makes one wonder how much they are offering to the owner of www.copilot.com and why on God's green earth they would abandon the very strong brand name "Office" and www.office.com
Had to lookup office.com myself to see it; their office package is literally called MS Copilot.
It gets worse, actually. My comment was inaccurate because it could also be the windows assistant outside of MS Office.
At this point, Occam's Razor dictates companies must make these terribly confusing branding choices on purpose. It has to be by design.