“Your quotation in which Trump asks for a favor is misleading — the favor he asks is for Zelensky to look into Crowdstrike and the 2016 election.”

That’s one of the two investigations he asked for. As Fiona Hill testified, it’s disinformation from Russian intelligence, designed to falsely exonerate Russia for its 2016 intel op against the United States.

“A Big Lie is to deny that Hunter Biden’s no-show job with Burisma looks suspicious.”

Of course it’s suspicious. I’d go further. It’s obvious Hunter got on the board because his dad was VP, not because of any skill or knowledge Hunter had.
But it was fully investigated and found not to violate any laws. Despite that, as multiple witnesses testified under oath, Trump didn’t care if Zelensky actually investigated it, just that he announce an investigation on television, the only purpose of which is smearing a possible rival for personal political advantage.

“A Big Lie is to deny that Joe Biden’s explicit threat to cut off aid was a blatant conflict of interest.”

On this you are mistaken. Biden was the vice president. He did not set that policy. It was set by the entire U.S. government, operated openly in accordance with the anti-corruption efforts of the European Union, and Biden helped carry it out. It wasn’t a secret, second foreign policy track that broke U.S. law carried out on the side by the president’s personal attorney.
Followed the law vs. broke the law. That difference is everything.