There are significantly more than 21 results listed on Google. Google automatically hides what it considers "duplicate results". There's an option to "repeat the search with the omitted results included" on page 2, which reveals all of the 7,000+ results, of which the vast majority are different routers.
Exactly, it's an interesting example how quickly our brains can seem to lose access to skills without actually 'forgetting' them, considering how quickly people can get pack to normal.