No, it didn't.
Here is the first mention of left-wing violence in the debate. Note that Biden's response about non-violence was completely unprompted, as the question he was respondng to was:
"Chris Wallace: (30:35)
All right. I want to return to the question of race. Vice President Biden, after the grand jury in the Breonna Taylor case decided not to charge any of the police with homicide, you said it raises the question, “Whether justice could be equally applied in America.” Do you believe that there is a separate but unequal system of justice for Blacks in this country?"
Biden's response:
"Vice President Joe Biden: (30:59)
Yes, there is. There’s systemic injustice in this country, in education and work and in law enforcement and the way in which it’s enforced. But look, the vast majority of police officers are good, decent, honorable men and women. They risk their lives every day to take care of us, but there are some bad apples. And when they occur, when they find them, they have to be sorted out. They have to be held accountable. They have to be held accountable. And what I’m going to do as President of the United States is call together an entire group of people at the White House, everything from the civil rights groups, to the police officers, to the police chiefs, and we’re going to work this out.
Vice President Joe Biden: (31:38)
We’re going to work this out. So we changed the way in which we have more transparency, in when these things happen. These cops aren’t happy to see what happened to George Floyd. These cops aren’t happy to see what happened to Breonna Taylor. Most don’t like it, but we have to have a system where people are held accountable when… And by the way, violence in response is never appropriate, never appropriate. Peaceful protest is, violence is never appropriate."
So not only are you 100%, completely wrong in your assertion that Biden was asked multiple times and wouldn't respond, but Biden actually brought it up himself, unprompted, and condemned left-wing violence. Without ever being asked.
What are you doing here, man? You are better than just making shit up.