The court decision stays the July 29, 2020, injunction, issued during the coronavirus (COVID-19) pandemic, that prevented DHS from enforcing the public charge final rule during a national health emergency.
USCIS will apply the public charge final rule and related guidance in the USCIS Policy Manual, Volumes 2, 8 and 12, to all applications and petitions postmarked (or submitted electronically) on or after February 24, 2020. USCIS will use the date on the courier receipt as the postmark date.
It means that the Form I-944, Declaration of Self-Sufficiency was reinstated. The form is currently available online.
If the I-944 wasn't submitted during the period of injunction between 06/29/2020 to 09/11/2020, it will be required by USCIS.
https://www.uscis.gov/green-card/green-card-processes-and-procedures/public-charge