Yes, it does not seem too much and 2K is not providing too much information in relation to the game, but today it presented at least the NBA 2K21 loading screen.
To install mods you just need NBA 2K20 version of the external file plugin. This plugin allows you to easily install NBA 2K20 mods. Check out how to setup this tool. Get if from our Download Center and enjoy NBA 2K20 mods.