Final answer:
The NSF may regard the experiment by the PG Research group as not scientific due to a possible lack of adherence to fundamental aspects of the scientific method, such as rigorous experimentation and peer review, which the NSF does not endorse as aligning with its standards.
Step-by-step explanation:
The National Science Foundation (NSF) may deem an experiment as unscientific if it fails to adhere to the fundamentals of the scientific method, which include explicit hypothesis formulation, rigorous experimentation, repeatable results, objectivity, and peer review.
Experiments that do not meet these criteria may not provide reliable findings, and therefore, cannot be considered rigorous science. If the experiment performed by the PG Research group lacked these elements, this could justify the NSF's position.
Furthermore, the NSF proclaims that any opinions, findings, and conclusions or recommendations expressed in the material provided by researchers do not necessarily reflect its views. This indicates that the NSF distances itself from research that does not align with its standards for scientific validity.