How Algolia tackled the relevance problem of search engines (blog.algolia.com)

They make some claims about the limitations of other search engines that doesn't seem true. Heck recently there was an article that says that google feeds a lot of signals(and we don't exctly know which), into a large machine learning algorithm, which they even don't know how it works.

So algolia knows how it all works ? yeh, right.