The interesting part is that, if I have understood them correctly, they have actually used the techniques in this paper to hack databases. Hence their Chicken Licken schtick. From other postings I know this person is a relative beginner (they've done the OCA course a month ago but not taken the exams yet). So it is obviously pretty easy for anybody with a little knowledge to get into insecure Oracle databases through iSQL*Plus.
The poster draws one conclusion from this - that Oracle is inherently insecure - when perhaps a more valid conclusion is that many Oracle databases are set-up by people too ignorant or too lazy to put even token protections in place.
I have clarified this with the original poster, and the database they have hacked is their own trial server and not someone else's.