Not really, except that they have a bunch of weird things in the source code and people like to make fun of it. OpenCode/Codex generally doesn't have this since these are open-source projects from the get go.
It's just an odd claim to make when it feels very much like AI generated content + publish the text anonymously. It's obviously possible to write like this without AI, but I can't remember reading something like this that wasn't written by AI.
It doesn't take away from the fact that someone used a bunch of time and effort on this project.
java.util.Date and java.util.Calendar are the two packages I remember struggling with as a new programmer. Which I guess is solved with java.time after Java 8.