Trump seemed fairly determined to change the election outcome, presumably by getting some votes overturned. The fact that the plan was kind of disorganised and hopeless doesn't mean it didn't exist.

>"The vice-president has the power to reject fraudulently chosen electors,” Mr Trump wrote on Twitter.

> “I hope that our great vice-president . . . comes through for us,” Mr Trump told the rally. (https://www.ft.com/content/6ff4a677-eb2e-438e-ac48-bb5da5a0e...)

Sounded like he wanted to use the rally to pressure Pence to "reject fraudulently chosen electors" and hence change the election outcome. Not sure if you call that a coup attempt or not but some people don't really buy the fraudulently chosen electors bit.