That's for sure.
For your point 1 & 2.
There is no time frame in which cleaning up would be completed, so Chinese definitely would be worried for their investment, unless you want them to halt all the work unless the cleaning up is declared 100% completed by COAS PA.
For your last point, Using a route and building a route worth billions of $ are 2 different things. From Chinese POV, there is no harm in shifting the project to east to lesser terrorism affected areas, only better protection, so why would they not do that. You have to understand Chinese are using that route old route because they have no other choice, But in this case they do have choice of shifting the project to east to add more security and stability to their investment.
And the link you provided, Is a thread on basis of a politicians remarks. And I Never trust a politician on economic related matter unless he is an expert.