Why is this chess puzzle so hard?

Below is the world's most complicated puzzle to solve (it never was! Ever!)

I've tried to solve it but still couldn't get the idea. There are many ideas of how to solve this, but none worked, maybe, one day you could solve this nearly impossible puzzle! (it looks impossible, but it's never 0!) link below.

Click this to be forwarded to the puzzle, the chess bot cant solve this.

Chess puzzle that beats bots, easy for humans!