If this is a reality of using cloud based ES then clearly it's something to seriously consider before using it - which is all the author is saying. The article is titled 'things to consider' not 'things AWS needs to fix'.
ES is big complex beast of a Java app. This is good advice regardless from someone who has used both approaches (self hosted vs AWS) in production.
I did not get the impress that he's saying that AWS can resolve this easily.