Before revision:  The estimation and inference are based on the Neyman-type orthogonal moment conditions , that are relatively insensitive to the estimation of the nuisance parameters.
After revision:  The estimation and inference are based on the Neyman-type orthogonal moment conditions tentatively outlined in Chernozhukov, Hansen and Wuthrich (2018) and thus relatively insensitive to the estimation of the nuisance parameters.