Both links are paywalled, but if I’m remembering correctly, that company (CMG) eventually had to correct their claim that phones were actively listening to everything you say. It was an overzealous marketing guy trying to oversell. They admitted in the end that they use the same info that data brokers have on you based on data gathered from your browsing and other activity, not from actively listening to you.

Siri for example is designed in a way where it “listens” for your voice to call it, but that mechanism is completely separate from the actual Siri that connects to the internet to understand you.