Plot hole: Blind Master can sense when a person is lying. When Snake Eyes admits he is not pure of heart he explains this is because he is driven by his desire for revenge on his father's killer, which Blind Master reads as a truth. However, this is still a lie: a lie of omission. Snake Eyes is only telling part of the truth and omits the fact he is betraying the clan on Kenta's behalf to get his revenge. Snake Eyes is being deliberately deceptive, which is the definition of lying.
Snake Eyes (2021)
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Directed by: Robert Schwentke
Starring: Henry Golding, Samara Weaving, Iko Uwais
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Trivia: There is a post credit scene where the Baroness tries to convince Tommy Arishikage to join Cobra now that his grandmother stated he won't be leader of her clan. Tommy told Baroness to call him Storm Shadow since he has now shunned his birth name.