Excellent observation and the real reason the issue of Hunter Biden is being used as a false red flag to justify what Trump did.
It is bullshit that Republicans have obtained Hunter Biden's tax records. The Joe Biden / Hunter Biden issue is ** nothing ** compared to what Trump tried to do to Biden.
If you have problems with the NYT, Politifact and Axios as sources then I can find many other websites that say the same thing.
"Once members of Congress turned their attention to Mr. Trump’s dealings with Ukraine, ** incorrect statements ** about the former vice president and his son started circulating again in far-right corners of the internet and on social media platforms like Facebook. Mainstream conservative media outlets like Fox News began running with some of the theories and Mr. Trump echoed them.
Here are four of the most prominent false or misleading rumors that have spread and an explanation of what really happened (to the extent that we know)."
https://www.nytimes.com/2019/10/29/business/media/fact-check-biden-ukraine-burisma-china-hunter.html
See also:
https://www.politifact.com/factchecks/2019/may/07/viral-image/fact-checking-joe-biden-hunter-biden-and-ukraine/
https://www.axios.com/joe-hunter-biden-ukraine-corruption-trump-1b031c30-3173-4a45-a6a7-2e551759063c.html