they're referring to that time spot prices went negative during the early pandemic when nobody was driving, demand was way down, and storage suddenly became a problem.
"Buying" some small amount of barrels during a rare market anomaly, then burying them in the ground is supposed to accomplish what exactly?
Great, you buried 50,000 barrels of crude - congratulations. Now what are you going to do about the 20,000,000 barrels[1] the US will consume tomorrow? Look, oh no, your buried oil leaked into the water table!
[1] https://www.pbs.org/wgbh/americanexperience/features/pipelin....