This is the last time I am pasting the same info. You are misunderstanding Section 2b1.

REAL ID-compliant driver’s licenses and identification cards can be issued to BOTH U.S. citizens and non-citizens (such as lawful permanent residents and certain visa holders). Since non-citizens can obtain a REAL ID, it cannot be used as sole proof of citizenship—only documents like a U.S. passport, birth certificate, or naturalization certificate serve that purpose.

If you are still confused, Senator Morelle breaks the act down page by page: https://democrats-cha.house.gov/sites/evo-subsites/democrats-cha.house.gov/files/evo-media-document/SAVE%20Act%20Section-by-Section_BRANDED.pdf