After tons of digging to see if I could finally get that one last piece to get the gold trim around the collections badge, it appears that the gear was "un-sunset" during "Season of the Splicer" with no way to get the items to drop.
In the process of digging around trying to find out whether or not the gear was actually dropping, a ton of people get confused between the Scatterhorn set and the Tangled Shore set. People have mentioned looking at the vendor pools on Light.gg to see if Ada-1 or Xur will end up selling the set at some point this season.
Ada-1 Vendor Pool: https://www.light.gg/db/vendors/350061650/ada-1/
Xur Vendor Pool: https://www.light.gg/db/vendors/2190858386/x%C3%BBr/
Upon checking their pools, it appears that the items are not up for sale by any of the vendors, and there is no drop source at all for this gear. With forsaken being sunset, the window of this gear could be closing, and my inner collectionist is crying out in pain.
Bungie, Please make this gear obtainable again before Forsaken is sent to the DCV.
Edit:
Tangled Shore gear is confusing, and out of the three sets of gear, only 2 are dropping. The other set is currently "unobtainium".
Spoils of the Shore ([b]Obtainable[/b]): https://www.light.gg/db/legend/3790247699/collections/1605042242/armor/1269917845/warlock/676075319/world/2983784775/spoils-of-the-shore/
Tangled Web ([b]Obtainable[/b]): https://www.light.gg/db/legend/3790247699/collections/1605042242/armor/1269917845/warlock/676075319/world/2983784769/tangled-web-suit/
Scatterhorn ([b]Reprised, but Unobtainable[/b]): https://www.light.gg/db/legend/3790247699/collections/1605042242/armor/1269917845/warlock/676075319/world/4139791854/scatterhorn-suit/
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Xur may sell it after Forsaken gets vaulted. Since he sells gear from vaulted locations right now.