Please read my response carefully.
Preconceived intent of filing AOS prior to being admitted into the US is considered a fraudulent misuse of of a NIV.
In general a person could enter the US on a NIV, following which they experience a change in circumstance (after being admitted into the US), they will be okay to file AOS in that case. That is not what the OP has indicated here.
When it comes to DV2021 selectee right now, based on the current proclamation, it is obvious any such selectee who decides to enter the US is harboring a preconceived AOS intent.
And like I previously stated, for DV based AOS, there’s the clause re legally residing in the US as at the time of being selected which is required in order to be AOS eligible:
“
Diversity Visa Winners Legally Residing In the United States: Apply Through USCIS
There are, however, a small number of lottery winners each year who,
at the time of “winning the lottery,” are residing in the United States in a nonimmigrant or other legal status. For these winners residing inside the United States, USCIS processes adjustment of status applications.”
USCIS Diversity Visa Lotter