Yeah, now that I think about it you're right. Its over.
Considering the excessive OPSEC even in civilian aviation industry, no news does not necessarily mean it's not happening. Also, indigenizing ARJ-21 is a rather low priority compared to delivering C919.
In China, regional airliners are facing strong competition from high speed trains. For some components of ARJ-21, the small total size of the orders on the airplane probably will never justify the cost to develop domestic substitutes. If there are components that can be shared between ARJ-21 and C919, there are chances for them to be indigenized on ARJ-21.
It's all about sorting the priorties.
Strategically, commercial airliners are less critical to China's economical and social development. There isn't urgency for indigenization. I don't see the US and EU to completely cut off civilian aviation supplies any time soon, aircrafts or components. There are not many options left with the US and EU to balance trade with China. If that does happen one day, it will be in a full out war (not necessarily a war that involves military forces). In such situation, the CPC politburo won't be worried too much if the Chinese commercial airlines are ground to halt.
In civilian aviation, full indigenization has never been the goal because that wouldn't make sense economically and technologically. What China needs is the bargain power the assures uninterruptible foreign supplies. Such power can come from absolute dominance in a few key areas or dominance in many fields without key shortcomings. This is actually true for semiconductors, too.
I think the current approach is the best one. In this approach, the aircrafts are the platforms for most domestic suppliers to even have a chance in the game. The SOEs begin with building the platforms even if it means to buy most key parts and components from foreign sources. Until we see Chinese aviation components suppliers able to compete at the world stage, I think it is going to be way forward.
Unrealistically demanding full indiginezation does more harm than good.