From the article, it appears these death squads and their attacks occurred primarily during the Trump administration, as a result of a shift in policy: "Pompeo, then-director of the CIA, indicated that the agency, too, would pursue a more hawkish posture. The CIA, he said, “must be aggressive, vicious, unforgiving, relentless." And:

"The period in which The Intercept documented the escalation of violence in Wardak falls neatly between the first round of formal U.S.-Taliban talks in late 2018 and the signing of the Doha agreement early this year."

I can hardly say I know enough to clear Bush or Biden of using death squads, but it does seem like the major escalation and change in tactics occurred between January 21, 2017 and today.