> "Your phone knows its position in space"

This is not wrong at the pop sci level of the video.

Your phone undoubtedly has a gyroscope, accelerometer, and magnetometer all in a single IMU IC. Data from this IMU can be used to create a position cloud.

Add in some other sensor data to help collapse the position cloud, and your phone absolutely knows its position in space. Incidentally part of why IMU have magnetometers is that it’s basically one more sensor data to help collapse position clouds from just the orientation and acceleration data.

I think the only leap is how precise your phone would be with only gyroscopes generating orientation and acceleration data. But the video sort of hints at this when talking about the first rocket design using this data.