I think actually op is referring to https://en.wikipedia.org/wiki/Participation_bias: "Participation bias or non-response bias is a phenomenon in which the results of elections, studies, polls, etc. become non-representative because the participants disproportionately possess certain traits which affect the outcome."

Confusing terminology, but I guess "response bias" is about a false response by the participant to a question, and "non-response bias" is about whether the selected participant responded (participated) at all.