Fun, sure, but not an experiment that would actually be meaningful.
The data from your phone’s microphone doesn’t magically appear in Google’s advertising servers. It would have to go through a lot of steps before it gets there, and one of the first steps is in your home (if you’re on WiFi). One can analyze the traffic/data that leaves their phone.
It’s good to be cautious, but worrying about your phone’s microphone is potentially like worrying about your windows while leaving your front door open.
I thought it was a mistake/typo. Those don’t instantly become words just because a reader can guess the meaning