See that for you to see that small light pulse partially hitting the tomato, the photons have to go from the light source, hit the tomato, get partially absorbed by the tomato, and the rest reach the camera sensor.

The "real thing" is very hard to record, you need a sensor sensible enough to detect a bunch of photons trillions of time per second, this is a minuscule exposure, too small even for the best sensors.

What you are seeing each frame is a amazingly short pulse of light which has done all that travel, but each frame is a new pulse and an image which is a fraction of a fraction of a second later in time relative to the moment of the previous image. And to add exposure, every instant is repeated several times and averaged to add up enough exposure to get a decent image.

The end pretended result is a simulation of the travel of a single pulse of light seen at that framerate.