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“Left in the dark” is a common idiom for having information withheld. This particular use also uses a construction I think of as “implicit pass voice” where the “to be” part (is/has been/etc) of a passive voice construct is elided, it's more fully “OpenAI CEO Shear ![has been] left in the dark [about the reasons and supporting evidence for Altman’s firing], ... ”

"(was) left in the dark" means "wasn't given information"

Because the article title is terrible. Isn't it clear Shear didn't leave the board but "planning to"