The full sized helipad represents a massive investment of the already limited available real estate on the 056. You don’t make that sort of investment for only ‘just in case’ contingency scenarios, and if you did, you would not put such a huge helipad on such a small ship. Just look at how small the helipads can be on other corvettes and private yachts to give an idea of how much bigger than bare minimum the 056’s helipad is.
The only justification for having such a huge helipad on such a small ship is if they intend to use it to accommodate a wide range of helicopters, and also to give themselves room to perform critical support functions like refuelling and re-arming.
I've pointed out that my guesstimate is $100M for a Type-056
Adding a bit more hull for a larger helicopter pad comes at marginal cost, because it's mainly steel plus some labour
There was a Type-054A cost estimate from the Diplomat some years back.
That much larger hull and propulsion is only $77M, plus labour
I feel there's no need for the Type-056 to provide helicopter fueling and rearming, given the short distances to the Chinese mainland and the availability of other ships which can refuel and rearm helicopters