Certainly a PS. The two aircrafts are all number 06. Even if the number is right, why does the aerobatic team need that spine?
We've already had poorer quality pictures from other angles of J-10CY in August 1sy livery, and credible rumours for a long time that J-10CY is intended for August 1st.
That is to say, it should already be a forgone conclusion/expectation for us that August 1st will receive J-10CY.
The only question is whether this specific picture is Photoshopped.
Personally I think if it is a PS then they've done a very good job of it, because all of the details are exactly as you'd expect.
And if it were a PS I feel like they wouldn't have made the elementary mistake of making the J-10CY share the same number as the J-10A.