Yes. It's super hard to answer interviews or customer demos. Every sentence you say should include all preconditions that were said in previous answers, within the same context, because you may be quoted. You should think in live about all possible contexts in which your app might be used, and your speech should be as detailed as a contract.

Obviously here, he should have mentionned that they can recover a hit on a single data center, provided the customer chose multi-AZ hosting. That's probably why companies run their ads on "This watch is a legacy for your children" rather than any material claim.