They even say this - Rubio said that we do not live in a unipolar world any more - a comment which attracted weirdly little notice.
Biden's approach assumed a unipolar world which did not exist. That's why the Ukraine war, from the American imperialist perspective, backfired.
The achilles heel of the American empire was, ironically, always profit and greed. If there is one thing that could be used to persuade America to let its industry rot it is profit and its industrial malaise is largely responsible for the ever-more-obvious decline in hard military power.