In addition to its normal usages, (not nice, and has the meaning of), mean can also be used as a mathematical term to mean the average of a set of numbers. I always figured this was roughly the sense in which the word is being used in GMT.
How much did legendary leftist George Soros spend in 2016? A meager $17.5 million. So who is Tom Steyer? Steyer is the founder of Farallon Capital, a hedge fund that Fortune reported in 2008 had $33 billion in assets. He has since left the daily management of Farallon to run a non-profit committed to saving the climate, called NextGen Climate.
As a prominent political activist and supporter of left-wing causes, Hungarian-born billionaire financier George Soros has frequently been the target of smear campaigns, none more ridiculous than the claim (which first surfaced in November 2016) that he served as an officer of the Schutzstaffel (SS) in Nazi Germany during World War II.