Can I defeat telematics in a GM car?

Previously, I wondered what model car I should buy if I wanted to maintain my privacy. Thanks to everyone who chimed in, especially @kari, @qot, and @Narry. Although I astound myself to be typing this, I may just have found an option in a Cadillac Lyriq.

Earlier this year, the FTC banned GM from selling driver data to consumer reporting agencies and GM ended their egregious program. This and privacy laws in my state give me some small hope of avoiding the worst data collection practices. But, if I buy this car, I would want greater certainly that can only be had by physical intervention. Local audio/security aftermarket installers have nothing for me. Would anyone have a resource or ideas?