I highly doubt it. Why would they guarantee for a product of another company/ pgx
C-links return policy:
Money Back Guarantee
ComicLink provides a 6-day money back guarantee on all non CGC-graded comic books (including PGX books, unless the PGX books were purchased at auction). A return will be accepted if all of the following occur: 1) Payment is received from the buyer on time 2) The book is mailed back out to ComicLink no later than 6 days from the date received by the buyer, 3) ComicLink receives an email or phone notification within the 6-day time period that the book is going to be returned, and 4) The item is received by ComicLink in the same condition sent, within 12 days from the date the book was first received by the buyer. In the extremely rare event that CGC's competant staff misses restoration on a book, and that book is subsequently shown to be problematic at any time in the future (after being reviewed by CGC or by ComicLink's staff before it is cracked out of the CGC holder), a full refund will be issued.
They only appear to guarantee CGC books to be unrestored that could turn out bad.
Without a doubt they should