It has much clearer explanations, both written and visual. Really it's a stretch to say the Wolfram page explains anything at all, it just states it can't be how it appears.
The Wolfram page says they are similar, so can't have areas with that relation. But isn't it that they aren't similar, so can? Wikipedia seems to say the opposite of Wolfram, but I could have misread.
https://en.wikipedia.org/wiki/Missing_square_puzzle
It has much clearer explanations, both written and visual. Really it's a stretch to say the Wolfram page explains anything at all, it just states it can't be how it appears.