CPUC nor SDG&E cares, there are just too few people who used these kind of monitoring devices. I’d wouldn’t waste energy pursueing these guys.
A possible alternative route might be to pick up the zigbee signal with an SDR and decode directly. I have a cheapo (20 bucks) SDR laying around for that purpose but no time yet to mess with it.
See this: Get your smart electric, water and gas meter scm readings into home assistant with a RTL-SDR