As it's a VeriSign person saying that, I guess he's hinting at DNSSEC.
Not much more reassuring though, but still.
> "Although simplicity and performance have always been primary goals for
> Unbound, we have placed extra attention on security features, particularly
> since DNSSEC is not yet deployed widely,"
Is what the devs say. No security is of course faster and simpler than
implementing some security.