Where did you get that idea?

The law (IRC §6428A, from the COVID-related Tax Relief Act of 2020) says:

‘‘SEC. 6428A. ADDITIONAL 2020 RECOVERY REBATES FOR INDIVIDUALS.
‘‘(a) IN GENERAL.—In addition to the credit allowed under section 6428, in the case of an eligible individual, there shall be allowed as a credit against the tax imposed by subtitle A for the first taxable year beginning in 2020 an amount equal to the sum of—