Largely nonsense. In fact, American hegemony is doing better now than it has been thanks to the stupidity of its autocrat opponents in both Russia and China. Vlad's putting on cleats and stepping on his own member in Ukraine is well known, but Xi's sudden volte face on COVID lockdowns and the sputtering Chinese economy are also notable.
The Europeans in particular are more dependent on the US than before the Ukraine war and are actually taking serious steps to limit Chinese influence and find business opportunities elsewhere.