What did the SCOTUS find in the US v Nixon case?

In U.S. v Nixon case the Supreme Court unanimously ruled against President Nixon’s claim of executive privilege. Currently, former president Trump is attempting to use executive privilege to stop the Biden administration from releasing communications regarding the January 6th insurrection at the Capitol (article below).
What did the SCOTUS find in the US v Nixon case? What criteria did the court use to reach its conclusion?
Do you believe President Trump is shielded by executive privilege as he claims, or is the Biden administration correct in releasing communications related to a criminal and congressional investigation?
For Full-Credit
You must fully expand on what the SCOTUS found in US v Nixon, complete with citations (80%)
https://www.politico.com/news/2021/10/08/bannon-jan-6-subpoena-515681

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