Yes, I think so.
Even if we accept his claim that he knew nothing until 2013, when he couldn't have done much directly, his response was poor, he didn't meet with the victims until years later.
But it's also questionable if he really know nothing.
I think it is fair to say - sometimes a person can have heard rumors in these situations, but it's almost impossible to do anything if no one will come forward officially. You can't take action based on rumors. So perhaps he had heard something but there was no way to take action.
But even so, I think the look of the whole thing is so terrible that he should resign. It's not just about him personally, it's about the institution.
Disclaimer - I think JW is a flagrant careerist and a shitty ABC, who doesn't really care about preserving the institution so long as he preserves his career, and that underlies everything he has taken in this job. And he is a shitty priest to boot. So I'd be happy to see him go.