This is it. All matrix codes are now commonly referred to as “QR Codes”. I’ve noticed this especially at airports where both passengers and gate agents refer to the “QR codes” on boarding passes. (Which are IIRC Aztec codes)

Boarding passes are typically Aztec, but don‘t have to be. IATA allows other types as well: https://www.iata.org/contentassets/1dccc9ed041b4f3bbdcf8ee86...