I always wondered that whenever such reports or surveys come out why don't these organisations make the whole data and methodology public? Are they afraid that if they made it public, people will know how muddy these waters are?
They could be completely making up data or demonstrating the gold standard example of pristine data collection and brilliant analysis but we'd never know.. and for some reason, they don't want to tell us.
It should be pretty clear why they don't want to show and tell.
Regardless, without that information, we can only evaluate them based on how rigorus they've been in the past:
Are the researchers and organizations involved known for effective data collection and solid analysis?
Then they the should just say what those reasons are. What's there to hide?
You can't expect to be opaque and then the public to blindly trust you simply on the basis that you call yourself experts.