In principle, it's logically possible for such an attempt to be purely spur of the moment. But that wasn't what was under discussion. Going back one more post in the exchange, this is what theprestige asked about, which Parsman's post was in response to:
A plot does need to be organized, even if not
well organized. But even the conspiracies which were organized (though not well) were apparently not conspiracies to commit a coup or assassinate government officials. Quoting from my link:
"FBI investigators did find that cells of protesters, including followers of the far-right Oath Keepers and Proud Boys groups, had aimed to break into the Capitol. But they found no evidence that the groups had serious plans about what to do if they made it inside, the sources said."