How does DiD DR model account for non-normality

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Hello, I have a question regarding the Difference-in-Differences (DiD) Doubly Robust (DR) model. Could you please explain why this model is considered semi-parametric? Furthermore, when the outcome variable exhibits significant skewness, how does the DR model account for this in generating DiD estimates and standard errors? Are the model results still reliable under these circumstances?

Thank you for your time.