I sent you the updated mock-ups last week and asked if you had any feedback, and you never responded! Anything short of affirmative and specific buy-in is not really buy-in. If your updated mock-ups were one of 10,000 messages to hit somebody’s inbox and you received no response—or even a generic “looks fine” response—you might as well have not sent those mock-ups at all. Trying to win on a technicality won’t help you.