From https://www.wikitree.com/wiki/Help:GEDMatch#Links_from_GEDmatch_to_WikiTree
"These links only appear if:
- Your family tree on WikiTree is public
- You are not anonymous on GEDmatch."
There is WikiTree member with that name whose profile is privacy level private. If it is that person they would need to change the privacy level of their profile to public in order to enable the WikiTree link.