I am not sure why it's quarantined, just checked the link via accessing Patreon and searching for the author. The links match perfectly.
my guess is that there's something accidentally tripping the virus detection (if there is one), it's probably gonna be in quarantine until a human mod looks at it, but that's a fat chance with how understaffed itch is, I don't blame them though, moderating tens of thousands of projects is most likely a tough gig