The fact that 2 people are playing it disqualifies from being considered "difficult" for solo piano lol.
is not difficult as most people thinks and the difficulty depends on the arrangement
It's probably a joke/meme. Doesn't look super hard.
Then again, who am I to judge? I've only just finished Fur Elise and Raindrop Prelude and have been playing for about 8 months. Take my opinions on difficulty with a healthy dose of salt.