At best, it's hyperbole. It's certainly not "highly erroneous." The most useful websites, with the largest user bases, will also have the largest developer bases, and change the most frequently. That's just kinda how the internet is. Consider - if a tool like this had been written 20 years ago, are there any websites it would still work on today? What about 15 years ago? You're not wrong that some of the smaller websites might take longer to change than the larger ones, but the calling the notion that most websites change over time "entirely erroneous" is just silly.