IMHO, this is not a good source.
Wikipedia's only source it the same article from WantChinaTimes, but WantChinaTimes is known for its inaccuracies, and this article is full of them.
Start with the very photo they use to represent the J-16...which is a single seat J-11. The J-16 is a tandem seat aircraft based on the J-11BS.
Among others, at the end, they repeat this whopper:
WantChinaTimes said:
Late last year, after several years of negotiations, Russia finally agreed to sell 48 Su-35MB fighters to the PLA.
How many times does that have to be disproven?
Sorry, but based on these sources I do not believe at all that the PLAN has taken deliver of 24 J-16s.