:The article actually is unclear on the origin of the style or why it became popular, so it's not "inaccurate" it just "isn't". The links you provided don't say much but I can use this information to research further and flesh it out, the notion of the safety razor is intriguing if I can find reliable sources to back it up. It looks like what happened was the safety razor (1901) allowed for easy daily shaving, so many people got rid of their facial hair, but for some reason the curves of the top lip made it dangerous with this type of razor so many just left that section unshaven. But I'll need to find reliable sourcing before adding to the article.