Searching for "deep paper" in the context of does not yield a specific gameplay mechanic, official mod, or community-wide term by that exact name. It is possible you are referring to specialized editing guides or roster projects that document the game's mechanics in extreme detail.
: Community guides define file size limits for custom assets, such as "Cyberfaces" (700KB to 3MB) and "Courts" (17MB to 30MB+), to ensure game stability. Search results for NBA2k14
For instance, veteran modders like Slimm44 at the NLSC Forum have produced extensive "papers" or guides on editing attributes, sliders, and roster projects to achieve more realistic gameplay. Searching for "deep paper" in the context of