Regarding this experiment which was carried out in 2012:
I'm wondering how could the scientific society be totally convinced(prior to this paper being published) based on a purely theoretical ground that the Observer Effect is not the true content of Kennard's derivation of Heisenberg's uncertainty principle, notwithstanding that his derivation doesn't resort to interactive measurement( measurement with light being shed on a system or whatever you like).
Since one could still stick to a view on QM which considers the theory as the theory of measurement and not an intrinsic and interaction-free general theory so that even Kennard's derivation can be considered as merely a semantical flourishing of the "observer effect" rather than a theoretically vital refusal of the "observer effect".
I mean one could still take the position that QM is intrinsically inclusive of interactive measurements that are carried out to exploit information about a system, no matter if the language and semantics seemed to be ignorant/independent of any interaction. A view that considers QM as an effective theory of measurement that has interaction implicit in itself.
I guess it's not bad to share the abstract of the paper itself which doesn't leave space for ambiguity:
While there is a rigorously proven relationship about uncertainties intrinsic to any quantum system, often referred to as “Heisenberg’s Uncertainty Principle,” Heisenberg originally formulated his ideas in terms of a relationship between the precision of a measurement and the disturbance it must create. Although this latter relationship is not rigorously proven, it is commonly believed (and taught) as an aspect of the broader uncertainty principle. Here, we experimentally observe a violation of Heisenberg’s “measurement-disturbance relationship”, using weak measurements to characterize a quantum system before and after it interacts with a measurement apparatus. Our experiment implements a 2010 proposal of Lund and Wiseman to confirm a revised measurement disturbance relationship derived by Ozawa in 2003. Its results have broad implications for the foundations of quantum mechanics and for practical issues in quantum mechanics.