Is in the perimeter of the PCB, under the PCB, a trace that rounds it. you can see a grey circle in its circumference.

Hello, Top left is antenna, top right is a thermistor, a temperature sensor.

Here is a photo I took of the freestyle v1 I took 5 years ago:

https://i.imgur.com/e3jAipX.jpg

Here the antenna is a trace around the PCB.

This. Actually the whole process of tearing apart the metal cover with heat is totally not needed. Both halves are kept together with just 4 clips.

Actually in this video you can see that the lens move, but I miss a camera dissection or x-ray view to see if actually there are magnets and coils that could support OIS on the ‘disabled’ lens.

Step 13 misses among the status led a reed switch which is responsible for activation upon case opnening.

Sorry mate, that's not a CPU board but a SHDSL line filter. CPU is the biggest, center chip (freescale)

Of course you can choose to be not tracked. There are GPS signal blocking devices for cars. Once you block the receiving of GPS signal the tracking device wont know where is it thereby FBI can not track you.