I believe @pozzum is away at the moment so he is not currently activ on the forum.
Regarding NPC's , are you able to install pofo' s using cheatengine.A byte in the pofo for the NPC characters needs to be modified and the pofo reinjected.
Regarding modding 2k20, there are modders working on it. If there was progress , it will have been documented on the forum. The main mountain to climb is being able to modify a file and reinjct it back into the game .
In my opinion, even if we can eventually modify a file and reinject it back, modding 2k20 will never be like like modding 19 or previous games especially regarding importing assets from previous games. The ease with which we could use mods, character models, animation files, arenas, props etc from previous games in 2k19 isn't possible in 2k20 .