Hello Sami,
Great question and apologies for the confusion. The answer is, both are true. Since we only have 2 hours for the exam, we aren't able to test everything that is listed in the PDF, however the PDF contains tasks which a candidate should be proficient at in order to successfully pass the exam.
So to be more specific, any task in the PDF is something that can possibly be asked during the certification, but we are not able to publicly state which those are since this is an exam. This means that the best way to be prepared for the exam, is to make sure you are familiar with each task in the PDF, even though potentially only half of them will be tested on during the exam.
I hope that clears up the confusion and good luck on your certification!