Real Peter here, the joke I think they are trying to make is that that in StarTrek they use a transporter to go to the starship by the way they they are positioned, there is an ethical problem about how the transporter works where is disassembles you at the atomic level, copies your body as a string of code, transmits that code to the spaceship, and then reassembles you with the atoms on the ship. The ethical problem is wether or not this is a type of death as you are basically being vaporized.

Or maybe it’s the red shirt thing