I am not sure why you are mentioning historians here. A proper historical view/investigation is way outside of my scope.
My angle is simple: they said it was accurate, and Legasov did so and said that...and in his own words, he negated most of that.
Is Legasov a good guy? I don't know. Was he honest in what he said? I don't know...but he said what he said!
> cherry-pick inaccuracies
Feel free to go to the tapes