The syllabus has not changed, and so your book is fine 🙂
If you are watching my free lectures then you do not really need a Study Text. The lectures are a complete free course, are up-to-date, and cover everything needed to be able to pass the exam well.
However you choose to study, what is vital is a Revision Kit from one of the ACCA approved publishers. They contain lots of past exam (and other exam-standard) questions for practice, and practice is vital to passing the exam.