The tweet is literally just a picture and a quote, nothing more. It does, in no way, prove your statement correct. It doesn't even provide any new information at all.
"JF-17 Thunder guarding Pakistan skies through within & beyond visual range capability" Ok....we already knew that. It does not state that the BVR capability is new in any way, and just seems like a standard recruitment Ad for the Pakistan Air Force.
I'd say the sources below look pretty credible :). Also, I have had conversations with two PAF pilots that said they used the SD-10 on the JF-17 waaay before you are saying they did ;)
Also, you didn't address this from my other post: "Even if your claim that the JF-17 didn't carry the missile until very recently is correct (unlikely, as others have provided credible sources proving you wrong), that should not have any bearing on learning the characteristics of the missile, since it has been in service for a decent amount of time in other areas."