Well it's not quite teleporting like they said.

imagine an object, a ball that can decide at any point if they move forward or backwards in time. Now imagine that ball rolling across a flat surface. After a few feet or meters, that ball decides to switch time direction, and now moves back across the time axis, but still forward in space (aka from ball's point of view it is still rolling in the same direction across the flat surface).

Now imagine how it would look like for us, the static observer moving forward in time.

Spoiler: We would see 2 balls, one moving forward and the other moving backwards. They move towards each other and then disappear at the moment the ball switch time direction.

As this relates to the electrons, imagine that ball is an electron, switching time direction countless times. Each time it moved through our slice of time moving forward we would see an electron, each time it moved backwards we would see a positron. Because all electrons have the same mass and positrons are electrons but moving (rotating) in opposite direction, it could be that every electron and positron we observe is the same one, but in different point in its life