I am finally DQ'd (after 11 months on NVC)
After the last RFE:
Resubmitted additional documents 22th March,
Resubmitted required documents (JS) 26th-27th March,
Also resubmitted additional documents 1st June (2021 Tax Transcript for JS)
So, it's officially clarified. They are reviewing documents based on the 'required document' submission date.
Hope it will help someone