It's not just for memorizing

With it's not just for memorizing, does the speaker implies that the method(?) has more rules?

(Video 11.35) And also, a great thing is it is much more resilient to forgetting. While I said earlier that usually, if you learn stuff naturally, 70% will be forgotten. if you put things on locations, usually, more than 90% will be there the next day. Also, it's not just for memorizing. A very interesting aspect is because, by using keywords, you also need to kind of symbolize them to place them there, It's also an interesting tool for text analysis. Because when I do it, I very often have the experience, that a certain keyword, a certain symbol seems similar to something I read 10 minutes ago.