It does so by eliminating a much larger number of situations. Essentially, it guarantees that you can always make progress by looking at at most two numbers and

It does so by eliminating a much larger number of situations. Essentially, it guarantees that you can always make progress by looking at at most two numbers and their surrounding revealed/unrevealed squares, until you reach the last ten mines, after which it allows board-spanning reasoning. In doing so, it eliminates a very large number of puzzles that might be solvable with deeper logic. So the version described in the article, where it generates purely random setups and you can ask for help if it's truly impossible to make progress without guessing, will actually give more interesting puzzles, sometimes. A more ideal version would even take into account probabilities, so that to get help you'd have to point it at one of the squares with the lowest probability of having a mine in it. (Or, as another commenter points out, a square with the highest probability of useful progress.)