This is absolute truth. No man has been wrong more and more often than old Joe.
If I were to guess, the aid to Ukraine was held up because the Clinton campaign, and Obama administration cronies (of which Biden was one), corruptly colluded with Ukraine to further the Russian collusion fairy tale and exonerate Hillary for her e-mail scandal (Crowdstrike). I think Rudy found that much of the "insurance policy" was run through corrupt officials in the Ukraine, and it was much more of a retaliatory strike on Biden for being a part of that motley crew than any worry about any threat that brain dead guy presented in 2020.
So yeah, Trump focused on the corruption that was used to destroy him, and I would have done the same thing. I would most certainly wanted to see that the corrupt Ukraine government was not still working with my domestic political opponents before sending them taxpayer cash.
Remember the part of the phone call where Trump told the new president that he was surrounding himself with some of the same suspects as the previous president?
It was foreign interference he was trying to investigate and stop.