Faux news! Lol! You can check Biden's speech, he never talked about China. This was all made up by Trump.
The rieason Biden and Pelosi called Trump xenophobic was about the so-called "Muslim ban" announced a few days before, just like they did for the previous Muslim bans, I.e. Pelosi speech on 27 January 2020
https://www.speaker.gov/newsroom/12720