Has one single shred of evidence been presented about these apparent Chinese media saying Pakistan isn't trusted? I haven't seen any and I'm Chinese.
The issue here isn't whether China can or can't trust Pakistan, or what Chinese media got to say on Sino-Pakistani relations.
The Chinese government has an
obligation to its constituents — the Chinese people — to safeguard key Chinese defense technologies, including from threat actors by way of Pakistan.
This isn't
necessarily to say the Pakistani state or military is currently engaged in
institutional backstabbing against China, but the inevitable reality is when you're dealing with a country of ~250 million, there will inevitably be a few "bad apples" to be wary of and to prepare for.
Looks like Indians are back at it again. They did the same thing few years ago by spreading rumors that 70% of the JF-17 fleet is grounded due to spare parts issue which was then picked up by Western news. I hope mods remove these unsubstantiated posts and clean up the thread unless a verified/credible source is provided.
The most effective propaganda vectors are based on slivers of truth.
While Indian information operations are obviously at play here, there's no denying Pakistani access to sophisticated Chinese weapons systems represent an inevitable and natural attack surface.
There's a reason why the PAF was given access to the PL-15E rather than the PL-15.