Yeah, there is still some level of uncertainty as they could just have crafted that data, but Reports (which are mainly talkie talkie with selected pieces of information - hence prone t cherry picking) are even more distant from raw data hence harder to confirm as "the whole truth" and when they're from Think Tanks funded by Governments (or, worse, with undisclosed funding sources) in nations that see China as an adversary (or China, or one of its allies) you know with absolute certainty that the makers of such reports have a huge incentive to push the viewpoint of the mainstream politicians of those nations.
Ultimatelly Trust is a scale rather than just two absolute points, and highly processed selective data wrapped with lots of text is itself less trustworthy because it's harder to check that it's both true and complete (i.e. hasn't been cherry picked), and sources which are funded by those who openly have very specific views of the target of such reports are much less trustworthy on that subject than sources not suffering from such a conflict of interest.