I'd suggest removing the email address from your G2G post, since this is a public forum, especially if it is not your own email address.
It appears that the Ancestry.com member name and a GEDmatch ID weren't added when the AncestryDNA test was added to the WikiTree profile. If you haven't already done so, you may want to send a private message to the WikiTree member requesting more information.
If I understand correctly, you may have found a corresponding GEDmatch ID at GEDmatch that represents the unidentified Ancestry.com test that was entered on WikiTree. If that's the case, you should be able to use the GEDmatch ID to do a 1:1 comparison on the GEDmatch site, or use the GEDmatch ID in any of the other tools there to which you have access. But I'd still suggest contacting the WikiTree member for clarification.