I think these have been posted here for several times, but you know here is a forum and little people have enough scientific logic training. So just calm down and no need to waste your time
This news talks about both LIFT version of JL-9 to compete with the corresponding version of L-15 and a primary trainer to compete with CJ-7. By the way, the spelling of trainer in the title is wrong
Many of the CJ-6 still have quite a long life left, so this is why you can hear little news about CJ-7, even Hongdu itself does not care about it. So everything can be changed for the next tens of years. As to PT like PC-21, I think it depends on whether PLAAF wants to spend or save the money...