Do I have to be in Product Management to benefit from the Online Courses and Certification?

It depends on the course.

For the Optimal Product Management and Agile Product Management courses, you don't have to be in product management. If you want to move into or your job requires significant interaction with product management, you will also benefit from either of these courses.

However, the Digital Product Management course is more advanced and has a prerequisite of at least three years of experience as a business professional.