Not sure of current pdf, but when I did it, those fields auto-populated with same data as the main form.
Did you try to print the entire form after filling out the first part? Could be that on printing, the CLEO gets auto-populated.
The credit card info did not get populated in the CLEO part, so someone put some thought into it.
I didn't try printing it first. On this version (October 2020), the credit card section is blacked out on the CLEO part. The smarty pants wife figured out a way to add our own text boxes to each field of CLEO. It was tedious, but much neater than my handwriting...and therefore probably worth the trouble. I have a somewhat unusual last name, and it is often mis-interpreted when I write (I have club memberships and credit cards with it misspelled, and even my DC letter initially had it wrong).
They are going out in the mail tomorrow, so