[The KG9 Kid]

"... I’m not aware of any reliable record of cases in which justices have read their dissents from the bench..."

Justice Souter read his dissent from the bench in DC vs. Heller back in 2008.

[Notwithstanding]

You misunderstand the author. He was stating that he is not aware of stats on how many dissents are read each term by each justice. ;^)