https://www.powerlineblog.com/archives/2019/08/michael-mann-refuses-to-produce-data-loses-case.phpDr. Mann's work (including the "R2 regression") was reviewed by experts in the field of climate research before it could be published. Dr. Tim Ball is a geographer. How would you feel if the lead contractor on a job asked one of the landscapers to inspect your plumbing installation?
There is a Dr. Ball who is a statistician -- Dr. Patrick Ball --
https://en.wikipedia.org/wiki/Patrick_Ball
Perhaps you have them confused.
Did you look up "R2 regression" yet? A real statistician (or, for that matter, anyone with even modest training in a laboratory science) would recognize the humor in that.
He had 8 years to produce the data.