Well that's not a very real distinction. No observational study can ever claim to prove causation at most it can provide data that supports causation is highly

Well that's not a very real distinction. No observational study can ever claim to prove causation at most it can provide data that supports causation is highly likely. The conclusion and how it's presented will naturally be in terms of likelihoods of some outcomes based on certain assumptions — which is exactly how this research is presented.