Point (IMO) is, that the Pakistani social media scene is currently so much overhyped and unrealistic that some refuse to accept facts.
[funny modus on]
This goes even that far that some are claiming - "brother, I told you, I know!" - that in 2018 a third J-31 was flying, since then already nos. 04 & 05 are preparing for a secret handover to Pakistan "soon" so that Pakistan can help perfecting this fighter for the PLA, in the same way, Pakistani input made the J-10C what it is today!
[funny modus off]
Anyway, some of these guys are so obsessed, that the PAF will get their first J-31 within the next 15 to latest 18 months again based on "brother, I told you, I know!"
So, jokes aside ... I'm in fact pretty sure, IF - and that's the point - IF the J-31 ever materialises as a land-based fighter based on the J-35, it will take time - and surely more than two years - and even then, SAC will at first concentrate on building J-35s for the PLAN NA and surely not for Pakistan! Then maybe in several years but again IF!
but again, what do i know? 
