Global responses to some common concerns among reviewers

We appreciate the reviewers' thoughtful comments. We will do our best to address the reviewers' other points in the paper's next version. Incorrect link to code and reproducibility (R1, R3): We most sincerely apologize for the error! We have verified that the code is now available at the included link. R3 on assumption for Theorem 4.2: This simplifying assumption is contained to Section 4.2 of the paper, for the purpose Our analysis and experiments do not require this assumption in general.