The key word here is Advertising, truth in advertising is a very different beast and in WaniKani’s case it’s not even a stretch, people did finish it in a little more than a year you can take a look here My Journey of 368 days (+ The Ultimate Guide for WK 📖 ) and it is not an anecdotal example.
The point of advertising is to make you look and to entice you to give it a try, the reasonable consumer will check the data beyond the advertisement in order to make a more informed decision. It’s nothing more than that.
Is it annoying to know that it is possible to reach level 60 in a little more than a year, that people did this successfully because they can? Probably, sometimes, depends on what headspace one’s in.
Is it super annoying how advertisement works on one’s brain when it’s something they already wish for? definitely. The problem is that saying something like “in a little more than a year up to 8 years!” might be true in actuality but as an advertising point, really falls flat.