Another with heavenly inspiration. How does Hard for 22 know. Aha, he is using a aristotelian syllogism:
1. Quick teens don't get faster
2. Jakob is a quick teenager
Therefore: Jakob is not going to run faster - defininily, finally, absolutely. Q.E.D
Hard for 22 is also using anecdotal evidence in a rhetorical way: Ask Amos.
I don't know where Hard for 22 lives. But they must learn something at school or college?
His "reasoning" is inductive. Since "quick teens don't get faster" Jacob can't get faster. But it is both logically and emperically possible that Jacob can run faster.
Though, since I deny what Hard for 22 writes I must be an extremely biased racsist. Q.E.D. in Hard for 22's mind. I don't say that Jakob is going to run faster, but he might do it, he might even run 3.27. It might even be probable. Strange guy, this Hard for 22.