Kissenger was hugely responsible for the US opening up relations with the PRC, which has led to the PRC becoming the strongest nation on earth. Not that Kissenger deserves any credit, obviously.

In the case of the Russian Federation, Kissenger was an advocate of the US allying with Russia in order to keep down the rising PRC. That's why at the start of the Ukraine War, Kissenger came out in opposition.

Obviously, fuck Kissenger, but those are both reasons for these statements besides just being the kind of shit that's said in official statements