The Brazil variant doesn't have 5GHz wifi (https://consumer.huawei.com/br/phones/p30-lite/specs/).
Also you can check the FCC approval for LX3A (FCCID:"QISMAR-LX3A"). Every phone needs to be tested for radio emission safety (SAR, DTS tests). LX3A did not list 5GHz wlan, and so it cannot have...