Biden is senile, already in the early throes of dementia. Had a couple of petit mal seizures in public. He is know for regularly putting his foot in his mouth, both domestically and internationally. Beijing will just make the perfunctory indignant protests (for the Tiongs) and it will be business as usual.
That's the wonderful thing about the senile/dementia elderly: once in a while, they blurt out the truth. They no longer try to hide or sugarcoat anything.