Let's put it like this - Ninglenel "DPS dummy" was a secret for 2+ years known by very few individuals before some mor0n decided to share it on Reddit bringing ZOS' attention and removing it. Basically the same applies to memento's levitation effect and its ability to skip stuff.
TheTwistedRune wrote: »I reckon it has been removed because they are going to release something similar as a personality. Levitation is a much requested feature so they probably want to make money off it.
I'm not dissing ZOS by the way, just proposing a hypothesis as to why it's been removed.
I think some people said that some were using it to glitch into walls and skip parts of dungeons and trials