Comment by throwaway_j12

The Guardian piece is one of many quoting US officials who were trying at the time to argue that China was involved in the conflict. The purpose of the timing of these arguments was to put pressure on German Chancellor Scholz before he made an economic interrelations trip to China (https://www.bundesregierung.de/breg-en/news/scholz-trip-to-c...). Notably that failed to gain the American officials what they wanted, as Europe continues to engage economically with China. That time and the time for that misinformation argument has since passed. We're on to other "assessments".

"Biden calls so-and-so a mean thing" is not evidence of mean thing. Using it as evidence is a logical fallacy ("argumentum ab auctoritate"). To help you understand why the US president said this, leaders call each other mean things (and even sometimes vaguely call of other's assassinations) as provocations, and in order to shape public opinion (yours).