That stuff is literally not a disqualifier in our page:
Furthermore, there are a few criteria which show that a beam is not behaving like realistic light:
- The beam is shown to move at different speeds in the same material.
- The beam curves through the air or otherwise doesn't travel in straight lines (with the exception of realistic refraction or deflection).
- A laser may cause explosions, but only if it rapidly vaporizes some matter, meaning that the target needs to be partially destroyed in the process.
Zapper's beam does none of this. Plus the thing is just a pun for volume meaning both size and sound here, and the beam becomes bigger because it increases the volume (also because I don't remember it emitting any sound in-game).
Like, do we treat any character being able to enlarge their light beams a contradiction to SoL?
Cinematic time, by your own words.
And we treat magic as the same as the irl counterpart
unless there's a drastic contradiction, but there's not here. We do not treat Flowey's light as SoL because of the contradiction of it being able to physically stop and knock on Napstablook's door, but there's is no such contradiction here because "it's too slow on-screen".