He literally explains in the video that the timeline didn't line up. Biden was too busy with his proxy war in Ukraine and doing a genocide in Gaza to worry about directly attacking Iran at the time. The plan to fight Iran and having Israel provoke the war has been in the works for over a decade now. This was all just a matter of time, and Trump simply happened to be the one to preside over it.


https://www.brookings.edu/wp-content/uploads/2016/06/06_iran_strategy.pdf
Russia obviously has benefited from the incompetent way Trump tried to prosecute the war, but it's obvious that the goal was to destabilize China's oil imports and to destroy Iran the way the US destroyed Syria under Biden to cut Chinese land routes to West Asia and Africa.