On laptop you have to tilt the screen towards you a lot more than usual and look at it just above the function keys. On desktop you have to stand up for the same perspective.
Illusion is seeing something that isn't there. They can be caused by multiple factors be it one affecting the observer or one that arises from the subject being observed.
This demonstrates perspective and at no point do you see something that is not there. The text is there, it says the same thing. It does not appear to move or distort but rather as you tilt the phone the same light is viewed from a narrower height due to angles and it can be read as though it is not stretched.
That's an unhelpfully restrictive definition of illusion that is itself illusory. An illusion is also:
A sensation originated by some external object, but so modified as in any way to lead to an erroneous perception; as when the rolling of a wagon is mistaken for thunder.
The text is hidden or revealed through a change in perspective. That is the illusion.
It's a good thing shit like snow crash doesn't exist because if it did we'd be trolling people to tilt their phone to look and making them alt + f4 life.
I've seen so many of these I have gained the ability to read them straight on. In this case it doesn't matter, but I always feel like I've got one over the meme creator when it says something like "You look dumb holding your phone like that"
If you're at your computer and don't want to break a monitor trying to tilt it, just smoosh it vertically in MS paint or Apple iSomething to edit images. Edit: sorry what am I thinking - GIMP obviously