All of the US corporate social media platforms are part of the US military-industrial-intellegence complex now. Look at their boards of directors and executives. Look at Reddit:
Lastly, it doesn’t suggest that foreign influence operations aren’t a threat at all.
One can’t prove a negative, and I’m sure there isn’t literally nothing that has happened or will ever happen. But trying to propagandize the voters of the most propagandized country in the world probably isn’t the most efficient way to go about it. Bribing politicians surely would be more efficient, for example.