This is turning into a boomerang accusation.
The swiftboat model is obvious to everyone. There's no evidence. The witness is not credible. The behaviour described sounded like a deliberate attempt to mirror Trump's. It's clearly targetted at preponderantly Dem-voting woke females foolish enough to respond by saying both candidates are terrible so we won't support our candidate.
Once you see the connections, you understand the repellant nature of the people who came up with this angle.