I agree with you that DoS has not clarified or instructed on how the US will now process visas, both immigration and non-immigration types, for HK applicants differently. Any speculation is a guess only.
I would like to chime with a comment on how the initial question was originated - the POTUS issued an executive order dated Jul 14th, 2020 with the following statements:
"Section 201(a) of the United States-Hong Kong Policy Act of 1992" gives the POTUS legal ground to review and, if see fit, to revoke the "continuation in force on and after July 1, 1997, of all treaties and other international agreements".
And the EO also specified that those statutes will include:
"Section 103 of the Immigration Act of 1990" specifies the "separate foreign state" status of HK from China and "203(c)" concerns the allocation of DV visas to foreign states.
In short, what I see from these quotes is that the US will no longer consider HK as a "separate foreign state" from China, affecting HK people's eligibility for DV and visa applications.
Again, I will be more than happy to see and incline to think that this EO will not retrospectively affect our eligibility in DV 2021. Yet, I am still a bit hesitant about whether DoS and USCIS will use the EO as a ground to deny issuing DV or AOS. I think it is something I can only be more certain by asking them directly.
Anyway, thank you for your effort in keeping this forum an exchange platform for accurate information.