There are no specific issues with Realtek drivers with the Windows 10 2004 update, except perhaps extremely old drivers. If there were any issue with current drivers, the forum and any other Windows 10 related forum would explode with this issue, because half of all Windows machines in the world are running with Realtek, but they didn't explode.
(Actually the forum exploded since a few months, but this isn't due to Windows 10 updates or Realtek drivers, but because of the Corona crisis where a vast number of new OBS users come here with their issues. But basically the issues are the same as ever: I have lags, I have black screen, I have bad quality, How do I configure audio)