Is it just me, or does the bad advice format of the article make it hard to see tell the good advice is?

In my early days teaching LaTeX classes, I used to have an example of incorrect input in the first day’s material (forgetting to leave a space after a command). Even though it said before the example that it was incorrect, invariably, at least one person in each class would type it into their computer and have the error returned to them. I removed the example because it only hindered the teaching process. I feel like articles like this which use opposite-speak in making their point do the same thing.