No, it is optional.
You are welcome to issue your own transcript and diploma if you prefer. In that case, you would report grades as “unofficial,” without credits. This reporting keeps you in good standing with PRS by providing backup to the statement you will affirm each semester that your child has received a “basic academic education” as required by law.
Unofficial high school grades are not reviewed by PRS and do not apply to an official PRS transcript or diploma. Instead, you would then “transfer” your child’s grades and credits to your own homeschool transcript and issue a diploma yourself.