This isn't about breach detection, it's more about "which of my many pwds that I use has already been doxxed and likely in a try first dictionary"?

Read the concern in the parent to what you're responding to. Essentially, "with this partnership, is Troy likely to hand wave if 1Password's logins are breached?" and the credibility concerns that this partnership may create.

PR management is what this is about. I wouldn't put it past a company to not do that when the situation arises.