How would an attacker get access to your phone via the built-in sensors? If I understand it correctly, some of the sensors include ambient light, accelerometer, fingerprint, GPS, gyroscope, infrared, proximity, and maybe others. How would a hacker break into a phone with these sensors?
I note that in the instructions provided above, it does not disable Cell or WiFi antennas; I assume it doesn't disable Bluetooth nor NFC antennas, either. Now those are ways your phone can be reached remotely. With WiFi scanning, an attempt to access your phone's wireless MAC address would reveal information about the chipset; same would be true for cell phone, which could reveal the IMEI.
As I learned a long time ago in security, the safest device is one that is never connected to any network. The question then is how to protect a network-attached device, be it WiFi, LAN, WAN, or other.
Check out Rob Braxman on YouTube, who is very interested in Internet privacy, security, and privacy and security on cell phones.