Deductions & credits

Is it still possible to carryback a Ponzi scheme loss for two years?  Or only carried forward?  I thought all such carrybacks except for farming had been abolished in 2020, but I see sites saying the Ponzi scheme can still be carried back a few years.  I can't find anything in IRS guidelines that specifically abolishes the carryback for Ponzi losses, but maybe that type of loss was part of a general group of losses denied carryback in 2020.  Anybody out there know the correct answer?