We have been linked with these since 2012/13 AT LEAST, these were officially reveled and announced only in March 2017. For the evidence dating before 2017 proving there existence in Pakistan, here is one for example.
View attachment 401639
This is perhaps enough to shown what kind of evidence (how authentic) was present suggesting/confirming LY-80/HQ-16 operational status in Pakistan. Other than this there are many threads on this weapons system since 2012/13 sharing some valuable information and with someone confirming there presence in Pakistan every now and then.