The black ledger was widely reported to be fake in mid-2019, so this is not new info. You can google up many reports.
“The black ledger was widely reported to be fake in mid-2019, so this is not new info.”
I believe you’re missing the point. The significant fact is not that the report was “widely reported to be fake”. What’s momentous is that the Mueller team new this as early as the Spring of 2018.