It’s too bad it took a challenge to keep you intellectually honest about what you were presenting. The fact is, whether the numbers are wrong or right, your representation of those numbers was dishonest.
I also stated that you didn’t under them to see if you’d take a more honest approach and you did which means you did understand what you were presenting. That said, it didn’t matter how you responded, you’d be in the wrong either way.
Good job taking the bait and proving the point with your explanation.