A lot of US benefits have “benefit cliffs” where making $1 more substantially reduces or even completely disqualifies a person from programs like SNAP (food stamps) or childcare subsidies or Medicaid. https://www.ncsl.org/human-services/introduction-to-benefits-cliffs-and-public-assistance-programs
It’s not surprising people whose families are directly affected by, or who know people affected by, benefit cliffs think the lawmakers set up taxes the same way.
Apparently she started out saying AI, then switched to A1 mid-statement. Might have been corrected privately before, but it only partially took.