Indeed that looks somewhat more organized. The Zigbee2MQTT “converter file” for the device appears to be https://github.com/Koenkk/zigbee-herdsman-converters/blob/89fd37d7fc0715e62fb6e62e83a9fc48cbb31fba/devices/tuya.js
It has much less low level code than the quirk, likely because it reuses generic code shared between tuya devices etc.