Hi,
Based on your question, I think you may find the answer here:
www.project-management-prepcast.com/free...all-this-mean-for-me
. Look for section Will You Update The PM PrepCast? > Additional PMI and PMP Exam Prep Update. From this article I get that Contact hours (*) earned for taking the course are still valid—no matter if you use the course before or after this change. However, after 2 Jan 2021, you will need to refer to the new Exam Outline.
The article also includes a number of tips and recommendations that you may find useful.
Gabriella
(*) On a side note, PDUs are those you need to have as a PMP certified project manager. As I assume you still have to take the PMP exam, what you refer to are (35) contact hours