I never made a mistake. Normal chess rules don’t apply in that puzzle so it was okay for that to happen.
I have seen loads of "joke" problems"and none of them are based on the "anything goes" concept. There is commonly 1 thing or 1 rule wrong and not like 10 things. That would take the joke out of the challenge. In this one, the last thing anyone would do is omit the white king as this is unnecessary to make the joke problem work. But perhaps you are right and is this the reason I never saw this creation before. A shoulder shrugger.
Puzzle #4 (Crazy Crossyroad I call it)