Well, there are obviously a number of roles that carriers can have for a Taiwan scenario, but also a general westpac contingency scenario.
My point is that we should be careful to not attribute the increased reach and increased range of exercises (both naval and air) of the Chinese military in westpac as necessarily being related to a specific contingency but rather developing more broad capabilities and experience that can be applied as part of multiple different types of westpac contingencies... not to mention the increased reach and location of these exercises is reflective of the overall increased competency and range of the Chinese military in a general sense, which would have occurred with or without any specific tensions (such as in Taiwan) or not.
As for carrier plans, err let's stick to what we know. i.e., that after 001A will be 002. The way it works is that we hear of rumours and we try to order rationalize those rumours into a sensible explanation -- we don't get to extrapolate out ideas that rumours have already suggested will not occur (like a second 001A when 002 is already on the cards).
I also don't know what you mean 001As are can "uniquely" contribute to accelerate PRC in Taiwan contingency and decelerate third party intervention... Is that because they are a carrier, or because they are a STOBAR carrier, or because they are just a high profile and high capability piece of military equipment? Because in all of those categories 001A is not particularly unique in assisting the PLA in any sort of Taiwan contingency or counter intervention strategy.
edit:
as for building 001A -- the rate that it's being built is probably less a reflective of any sense of urgency and more just a result of streamlined procurement and having a capable shipbuilding industry... I do not see the production of 001A or the procurement of 001A as being particularly related to any recent political developments. From what pop3 has suggested, the choice to build 001A was also due to 002 not having some of its subsystems ready (likely catapults), and the Navy decided they wanted another carrier before 002 could arrive so they went for 001A.
As pointed out in my previous post an increasingly hostile environment against China regarding its maritime territorial interests including Taiwan have been clear for years, I will add since at least 2010 to 2012, that is plenty of time to reconsider relevant military needs and plans accordingly.
Also as already pointed out in my previous post the 001A is unique in that it is the only carrier design reliable/proven enough and available soon enough to the PRC, it would also be a new build from the ground up according to Chinese specifications. If they didn't see a time sensitive need for carriers reliable enough for combat then they may as well have just waited for the 002.
There are also rumors that the 002 is delayed enough that there may be a gap between when the 001A is launched and when the 002 will begin building in the same dry dock, given they could build something else there or just leave it empty. But with the factors already mentioned this makes an additional 001A and a further delayed 002 a reasonable tradeoff.
While some political developments make a Taiwan contingency more likely the growth of China's capabilities makes it less likely.
Building a carrier is a very complex business that cannot be accelerated significantly because of some acute political circumstance.
Your first sentence is exactly me point. I disagree with your second sentence as I had pointed out before in my previous post and again above.
The relatively late acute development of a Trump presidency hostile to these specific Chinese interests, still at least several months in the making and previously a wildcard rather than expected to be accommodating, would still leave enough time to have affected even significantly these exercise plans.
Which brings me back to the interesting deployment of the 056A beyond the 1st island chain into true open ocean in the Western Pacific in these exercises which is most relevant to a Taiwan scenario.