Did you have Wikia create a custom namespace for you? "Party" is not a namespace that comes with default MediaWiki. Simply naming a page "Party:MyParty" doesn't create the namespace. From what I can see, that should be the only problem with your DPL example. Rather than creating a custom namespace, you can add additional search criteria to have DPL return pages only if they begin with "Party:".
Unfortunately, I don't know enough about JS to comment on whether or not there is an error in your code. However, I am unable to find where you import the custom script. Simply adding a ".js" page to the "MediaWiki" namespace is not enough to get the wiki to use the script. It must be imported using either MediaWiki:ImportJS (instructions) or importArticles. If using "importArticles", it must be done on the appropriate JS page.
Issues with Variables:
I haven't yet checked your use of Variables. However, I suspect part of the issue is that you haven't had Wikia enable the Loops extension.
That's really weird : I got a try again and I'm unable to see it, from 2 different devices.
Could you try adding a "test" party using those Clone's names just to see that all the process is working ? -> Arrows / Doggos / Lumberjackie / Magnet / Plain Bomb / Floating Bomb / Big Smith / Bomb Drone
The bad news is... no one in our contributors can get access to the preload... I contacted Fandom team, I guess it's probably something that we need to activate with them from the new Party namespace... :(