Looks like there are caveats to this law:

You would need to be a suspect in a crime that has a punishment of 5 or more years in prison in order for the phone to be geolocated.

For video/audio you need to fall under the definition of organised crime or terrorism.

BUT… If you are an environmental activist, someone might consider you a type of terrorist. So, this is pretty big news. Plus, there are loads of crimes that have 5 year sentences.

French sauce: https://www.lcp.fr/actualites/justice-l-assemblee-autorise-l-activation-a-distance-des-telephones-portables-pour