But he's referring to "us" and the country, not even a favor to him personally. And Biden's son is only mentioned in a later paragraph.

I think it really depends on how it was said in the call, it's difficult to say for sure if he was just going off a bullet point list of concerns with Ukraine, or had his mind set all that time on attacking Biden.

I guess we'll never know for sure, wouldn't be at all surprised if that was the intention though.

Edit: Also about the aid approval. I think the approval happened shortly after the call became public, not after some action was made against Biden's son, so it may be a case of "dammed if you do, damned if you don't".