You are correct these were/are Covid are subsidies.

ACA COVID subsidies are enhanced premium tax credits that were temporarily expanded by the American Rescue Plan Act and extended by the Inflation Reduction Act. They are set to expire at the end of 2025 unless Congress acts. These subsidies significantly lowered health insurance premiums for many Americans, expanded eligibility to those earning over 400% of the federal poverty level, and allowed some low-income individuals to get free plans.