What do you find offence with? Hip speech and yawn-2.0-s aside, I find the claim entirely defendable, given, of course, a certain set of assumptions in this very new and uncertain space.
I'm entirely ready to believe AI will soon write all apps and UI. I don't see such rewrites being a x10 market opportunity, given there's already "an app for that" even when there shouldn't be.
Uncertainty. Given incomplete information it is common practice to make assumptions about things to give us some starting point from which to act. In this context a round integer value pretty much implies: They are estimating, and they might be completely off.
I guess you could say, "Instead of making assumptions with uncertainty, let's not assume anything", but that makes progress in new and uncertain areas really hard.
It's a common and bad practice because quantitative language belongs in the domain of risk, not uncertainty. Two very different things. Risk is the world of stationary laws and empirical data. Fluid markets, mortality stats, that kind of thing. The "10x AI productivity boost" is about as real as the "10x engineer", that's to say, the PR department made it up. It's just vibes, but it's a symptom of a culture that unduly reveres anything that sounds "mathy".
I think it's pedantic argument. Obviously he meant that his bet is the future is something and willing to work for it. No need to scratch your head. 10x is not maths 10x and no one thinks it is literally 10.0x.