Are you saying that it's good news because it means that no actual users were exposed to the flaws? To the extent that those flaws apply only to the iOS version, I agree: that's good news.

Are you saying that it's good news because they tested something that you weren't ever going to release in that state? That's a tougher row to hoe, unless you're going to claim that your team inevitably would have found the same set of vulnerabilities that Scott, David, Alban, and Zooko's team found.

For a typical application --- yours isn't typical for any number of reasons --- prerelease or not, the state the application is in when a pentest team gets it is, from the perspective of security, the application customers would have received.