>>16774241 (OP)
It's basically just a statement of the simple fact that to measure something you have to interact with it. It's as if tou are blind, and to measure a billiard ball you have to strike it. So you can measure its location, but by doing so you change its location. Same for measuring it's motion.
It's a simple statement of the issues of taking measurements. But of course NPCs take it too literally. I'm astounded with how highly educated people seem to not have any intuitive grasp of the world. With people like this doing 'research' it's no wonder science is swamped with bullshit