I have no knowledge of any of this but the report doesn't either. It states those are estimated numbers culled from the web. AFAIK there is no actual public info on what the dollar amount is (and I certainly don't know what it is).

I do see everyone running with those numbers as if they were fact though. That's the danger of using such made up numbers in the report: everyone else repeats them as if they were fact even when the report says they don't know.