Yup, that’s the “J-31” prototype. Or the “J-21” one. Both designations have been used, at least in the press, creating some confusion as to whether there is one plane mistakenly being called two different things, or two different planes entirely (where the plane you posted the pic of is the J-21 and the J-31 is still rumor).
PLUS the question of how the J-21/J-31 relate to the J-20 stealth aircraft that has been well documented.
Oh...I believe they have a demonstratr, like the J-20 too...which is flying quite regularly and which they have two of...but I do not believe it is a prototype stage yet, much less ready for production.