Jonathan is happy that he does not have powers; it proves that his athleticism is human, not half-alien.

Do Jonathan and Jordan have powers?

They believed that Jonathan had the powers for quite some time since it appeared that everything in his life came too easy. However, that wasn't the case, and it was revealed that Jordan (Alexander Garfin) had Clark's Kryptonian abilities.

Can Superman have a child with a human?

In some stories, Superman is a father: he has a son with Lois in the 2006 movie Superman Returns, for example, and is expecting a baby with Wonder Woman in the comic Kingdom Come. But in other series, Superman can't have kids, and explanations often cite DNA from humans and Kryptonians as being "incompatible".