Layman summary: It took him years of wheedling and wrangling to get the complete data set used by some respected researchers incompetent/malevolent bozos and now we know why they were so reluctant to give it up. Key elements showing the blade end of the hockey stick were cherry picked for maximum effect. When the whole, with all points present was examined, the blade vanishes.
Significant modeling and other researcher's work was based on this fraudulently presented data and analysis that hinged on about 10 cherry picked tree ring measurements.