The rules were changed again 🙄. New rules for NOL carrybacks. Section 2303 of the CARES Act amended section 172 as revised by the Tax Cuts and Jobs Act (TCJA), section 13302, for tax years 2018, 2019, and 2020. Taxpayers can carry back NOLs, including non-farm NOLs, arising from tax years beginning in 2018, 2019, and 2020 for 5 years. See section 172(b)(1)(D)(i).

See link to pub 536: https://www.irs.gov/publications/p536