I think you do point to a real issue. The "falsehoods programmers believe about X" genre can be either a) actual things a common programmer is likely to believe

I think you do point to a real issue. The "falsehoods programmers believe about X" genre can be either a) actual things a common programmer is likely to believe b) things a common programmer might not be be knowledgeable enough to believe. This article is closer to category b. But the category a ones are most useful, because they dispel myths one is likely to encounter in real, practical settings. Good examples of category a articles are those about names, times, and addresses. The distinction is between false knowledge and unknown unknowns, to put it somewhat crudely.