My gut feeling is that De Niro has been compromised by people who know he’s in several videos that Jeffrey Epstein had made. And the Deep State douchebags have told him to get out there and say something bad about the Orange Man or you’ll be exposed.
Flattery works better on Bobby than blackmail, and if the reelection campaign is trying to blackmail somebody into being a spokesman for Biden, Bobby definately wouldn’t be anywhere near their first choice.