Why did Barack Obama attempt to hide his associations with Nadhmi Auchi?

https://theamericanreport.org/2018/08/10/obamas-billionaire-patron-nadhmi-auchi-sued-chemical-weapons-halabja-kurdish-genocide-co-conspirator-al-saadi-oil-for-superweapons-hamid-jafar-gulftainer/#more-2526

Club-K Container Missile System 
https://youtube.com/watch?v=mbUU_9bOcnM