Zoom is good at filtering out rather loud background noises. I can't imagine that the sound of background typing during a conversation could be detected by the other party.
So, in case that “what” was intended to denote some confusion, there is the most likely source.
Keystrokes should only be a problem when noise suppression is set to low/off, which you want to do for e.g. playing music.
But noise suppression is applied to sending audio, not receiving it. So you might need to tell your coworkers to re-enable their noise suppression.