I agree, especially since they are building a lot of them at once. If they were doing something really new they would build one ship and conduct some serious tests before starting "mass production".
That's what I thought earlier as well.
But looking at the building process of the 052D and the 054A reality teached me something different. Both classes had at least the second unit already in production before the first was in water or even well tested. With the 054A it where 4 first units. China has changed in that way, they are much more self confident in the shipbuilding programs, for good reasons. That's my lesson from that named classes.
And these classes had new features the predecessor hadn't.
nevertheless testing the IEP in a land based setup already happened. I'll provide images if I can find them again. Experiences with that concept where already made. To admit, on civilian vessels, but thoroughly evaluated by the technical institutes in china.