The article headline captures the essence of the issue exactly right "the AWS Java DOCUMENTATION is ...".

You can write Horrid examples in any Elegant Language and conversely you can give elegant examples in Brainfuck. The person(s) writing the Java example fell into the classic Java trap that mid-level Java folks fall into. Namely that trying to follow SOLID while writing an "Hello World" Distributed Java example.

They lost sight of the fact that the end product is supposed to be an EXAMPLE. This is why the senior devs (Java or otherwise) make the big bucks. Not because they can write complex hairy code but precisely because they understand when NOT to do it (almost always - YAGNI).