From my limited experience in modding (3 days), it is clear that in order to make a Mod, you need to Copy and Modify the CoreData BP.
Problem is, with any content patch or otherwise that effects this CoreData BP, you’ll need to recopy everything you’ve done into a newly duplicated updated CoreData BP.
Which is by far, the worst way about adding in mods.
There should be a new Class just for mods, a ModClass, that has some of the infomation as the CoreData BP like;
Override Lists for Similar,
Then all the the class does is load the DEFAULT CoreData BP, then stacks on the ModClass BP.
But as it stands at the moment, every patch, every mod maker will need to redownload the GitHub updated ARK Dev Kit, duplicate the new CoreData BP, modify the duplicate file to what they had before (A lot of work if your mod is extensive), then recook/reupload.