This is a Type 071 LPD. 
The smoke screen drill excuse is more transparent than the atmosphere on the moon. While it might fly with the non-military public, that was NOT a smoke screen drill for several reasons.
First, the Type 071 LPDs are powered by integrated combined diesel and diesel (CODAD) propulsion, controlled by an automated propulsion control system. They don't generate smoke the way you can with boiler systems. That smoke issues from the stack(s). This means you would need dedicated smoke generators.
Second, if they were generating a smoke screen the smoke would be trailing behind the ship and not pouring out of the bow, midships, and landing pad areas. Also the ship appears stationary.
Third, the smoke in the video is black indicating incomplete combustion. Smoke screen generators produce white smoke. This is created by un-burnt fuel droplets mixed with cool air. Either way, smoke screens are absolutely useless against radar directed naval guns and/or missiles.
I couldn't see much detail in the crappy cell phone video. I counted three, maybe four separate sources of smoke. None of them consistent with the smoke screen excuse.
The one I can't think of a reason for is the smoke column at the bow.
Regardless, that's not going to buff out.
WWG1WGA
Garde la Foi, mes amis! Nous nous sommes les sauveurs de la République! Maintenant et Toujours!
(Keep the Faith, my friends! We are the saviors of the Republic! Now and Forever!)
LonePalm, le Républicain du verre cassé (The Broken Glass Republican)