Which goes against the whole article anyway, since Jones didn't invent, or claim to invent, the concept of Pi either, that'd be a 3-way shootout between ancient indians, chinese or egyptians, Jones just assigned it the name Pi.
The article seems to be making the assertion that William Jones was the first person to use the Greek Letter "Pi" to represent Pi the transcendental number and the first to suggest Pi was unable to be "expressed in numbers."
So in that sense the claim is that Jones invented the association of "Pi" to Pi...the association of the Greek letter to the number itself.
The article really isn't talking about finding approximations for pi so neither Zu Chongzhi nor Archimedes or any other older mathematicians finding approximations are really relevant here. 
Frankly its not even a particularly interesting piece of history in my opinion. A curiosity but nothing more.