> How is this the fault of AI

It isn't, the article doesn't claim (or even imply) that it is "the fault" of AI, only that AI was part of the chain of events, and nothing is the fault of AI until AI is sufficiently advanced to constitute a moral actor. “At the source of every error which is blamed on the computer, you will find at least two human errors, one of which is the error of blaming it on the computer” remains true.

OTOH, it is potentially the fault of the reliance human actors put on an AI determination.