Well, to be fair, you are questioning terminology bastardization in "computer science," a field that is named after "computers" and "science" but has little to do with either. One should temper their expectations :) Informatics, a commonly used term in Europe, would have been a much better name.
However, information science (and in Finnish, informatiikka) is a synonym of library science. Computer science isn't too bad a name for a science about computing on (abstract) machines.
Well, just pretend that the whole discussion happened in German, where despite using your preferred term of Informatik, they still talk about Dynamische Programmierung.
Well, memoisation ain't exactly the same as dynamic programming. You can use memoisation to do dynamic programming, but you can also use it in other contexts (and you can implement dynamic programming in different ways, too).
