The Piglets have ordered 8 AIP submarines from the Chinese in 2015, they were supposed to be delivered by 2023 but the first of the subs from China haven't been delivered yet.
And ofc you know the Chinese manufacturing scale, it shouldn't have taken till 2023 also, possibly 2-3 years, but then again they know Pindi Piggies are playing both sides so can't be trusted and so the Chings are taking their own sweet time...
The Chinese btw themselves operate 20 of the submarines of the same model.
In a similar way there is no chance of them getting the J-35 which Chings also plan to use on their aircraft carriers of which 3-4 more are planned in addition to the current 3.