But one DNC lawyer’s argument actually tries to justify the party’s right to be biased on behalf of one primary candidate over another, according to an article from The Young Turks. In other words, they could have chosen their nominee over cigars in a backroom. That’s what the attorney reportedly said in a Florida federal court:
Do you have a more reliable source than "a laywer said"? Do you know which lawyer is alleged to have said it? Do you know if that lawyer is still working for the DNC? Have the DNC bylaws changed sine 2017 when this quote is alleged to be from?
You're making a lot of assumptions based on a poorly sourced anonymous quote from 7 years ago.