His English is fine man. His job isn't merely to debate these nincoompoops especially on western media but to be an effective "ambassador" to any country he's stationed at. The current Ambassador I believe was a high ranking official prior to this current appointment so he knows the whole dynamic of the Sino-U.S. relations.Massive kudos to the Chinese Ambassador in the US for going to hostile western media to speak about Ukraine-Russia-China
He is smart but i have one criticism though, he needs to improve his English. As an Ambassador he should be much better at speaking English
Second point, regardless of your ability to speak "polish english" debating with western media crack heads who relish on gotcha moments -- ask Trump, Biden, Hillary, Bill Clinton-- isn't going to matter one bit without resorting to rude tactics by cutting off your western interrogators (not journalist) which would then make you look like the aggressor that you are furthering the rhetorical perception of Chinese Wolf Warrior nonsense.