변호사 말이 맞아요. 노티스 받으신 기간이 3/1/20-7/25/22 사이여서 답변기한이 자동으로 60일 연장되었어요.
그리고 의사레터만 보내는걸로 설명이 부족할 수 있어 변호사가 RFE레터와 함께, 각각 반박/설명하는 cover letter를 써서 같이 보내주는게 더 안전할거예요.

USCIS Extends Flexibility for Responding to Agency Requests
Release Date
03/30/2022
In response to the COVID-19 pandemic, U.S. Citizenship and Immigration Services is extending certain flexibilities through July 25, 2022, to assist applicants, petitioners, and requestors. We anticipate this may be the final extension of these flexibilities. USCIS will consider a response received within 60 calendar days after the due date set forth in the following requests or notices before taking any action, if the issuance date listed on the request or notice is between March 1, 2020, and July 25, 2022, inclusive:

Requests for Evidence;
Continuations to Request Evidence (N-14);
Notices of Intent to Deny;
Notices of Intent to Revoke;
Notices of Intent to Rescind;
Notices of Intent to Terminate regional centers; and
Motions to Reopen an N-400 Pursuant to 8 CFR 335.5, Receipt of Derogatory Information After Grant.
In addition, USCIS will consider a Form I-290B, Notice of Appeal or Motion, or Form N-336, Request for a Hearing on a Decision in Naturalization Proceedings (Under Section 336 of the INA), if:

The form was filed up to 90 calendar days from the issuance of a decision we made; and
We made that decision between Nov. 1, 2021, and July 25, 2022, inclusive.
Under previously announced flexibilities, USCIS considered a Form I-290B or a Form N-336 if the form was filed up to 60 calendar days from the issuance of a decision by USCIS, and if the decision was issued between March 1, 2020, and Oct. 31, 2021, inclusive.

Please visit uscis.gov/coronavirus for USCIS updates.