Reverse Trump Derangement Syndrome? Why would that apply here? Pelosi's visit did kick off the whole process. The information is based on the U.S. liberal press and not Breitbart.
Biden at the time said she went on her own. Given everything that has happened since, it is not unreasonable to assume that she had more establishment support.
If you call that a "conspiracy theory": No it is just a theory. Citizens and journalists never get full information and are therefore forced to speculate. If they didn't do that, democracies would collapse.