Yes, he was a philosopher, but it is a fact that . . .
en.wikipedia.org
Falsifiability is a
deductive standard of evaluation of scientific theories and hypotheses, introduced by the
philosopher of science Karl Popper in his book
The Logic of Scientific Discovery (1934).
Falsifiability - Wikipedia A theory or hypothesis is falsifiable (or refutable) if it can be logically contradicted by an empirical test.
Popper emphasized the asymmetry created by the relation of a universal law with basic observation statements[C] and contrasted falsifiability to the intuitively similar concept of verifiability that was then current in logical positivism. He argued that the only way to verify a claim such as "All swans are white" would be if one could theoretically observe all swans,[D] which is not possible. On the other hand, the falsifiability requirement for an anomalous instance, such as the observation of a single black swan, is theoretically reasonable and sufficient to logically falsify the claim.
Popper proposed falsifiability as the cornerstone solution to both the problem of induction and the problem of demarcation. He insisted that, as a logical criterion, his falsifiability is distinct from the related concept "capacity to be proven wrong" discussed in Lakatos's falsificationism.[E][F][G] Even being a logical criterion, its purpose is to make the theory predictive and testable, and thus useful in practice.
Very important point above are two points. (1) The "Scientism: is "The
scientific method are the best or only way to
render truth about the
world and
reality." The problem here is scientists and scientific methods fo not make any claims of
"rendering truth." Please cite any and I mean any scientists that claim that they
"render truth."
The claim asses to the above is the vague subjective claim of the belief in "an exaggerated trust in the efficacy of the methods of natural science applied to all areas of investigation," Note that this is used as a pejorative accusation by "some scholars, as well as
political and
religious leaders," The pejorative accusation of Scientism often associates science with atheism.
Problem with the above the above reference which is false. Karl Popper rejected the old philosophy of Logical Positivism. He qualified the positive value of the conclusions of falsifiable hypothesis and theories as falsifiable, and not verified or proven,
en.wikipedia.org
Decline and legacy
By the late 1960s, logical positivism had become exhausted.
[51] In 1976,
A. J. Ayer quipped that "the most important" defect of logical positivism "was that nearly all of it was false", though he maintained "it was true in spirit."
[52][53] Although logical positivism tends to be recalled as a pillar of scientism,[54] Carl Hempel was key in establishing the philosophy subdiscipline philosophy of science
[17] where
Thomas Kuhn and
Karl Popper brought in the era of
postpositivism.
[49] John Passmore found logical positivism to be "dead, or as dead as a philosophical movement ever becomes".
[52]
Any accusation of Scientism is a strawman big time.