I suspect the commenter you’re responding to means ~”who leaked the source code referenced in the DMCA, and why”. The DMCA takedown request refers to a repo that it claims contains internal information and data from the claiming company.
literally has their name in the path/package name, so it isn't crazy (unless you know more?) to believe that this was stolen/reverse engineered Symantec code, no? At LEAST it's a very confusing and misleading directory tree for a random repository?
Files below src/ should be sources, not a 3rd party Symantec lib or whatever, so I'd give them the benefit of the doubt here.