It doesn't say they used Copilot. It says they used output *from* Copilot.

> his force used fictional output from Microsoft Copilot

That doesn't mean they used Copilot; it only means that the content originates from Copilot. They apparently got it from Google search result:

> officers had found this material through a Google search

And apparently that source either used Copilot or the source of their source used Copilot, etc.