Ok.. But he's putting this in context of evolution, not as the rule for theory definition?
That is a fact
. However, even more , Gould has, in another paper , reaffirmed that this is what a theory is about particularly when speaking of a scientific theory. He also is saying that facts are not always "true forever". Facts are only as good as they remain free from later editing.
always being modified.
The reason that Gould was sounding so combative in that paper was because he was the convenient target of Creationist spokespeople who enjoyed"Quote mining" Gould's popular articles that appeared in DISCOVER magazine. Quote mining involved a picking out of someones written or quoted material an then collapsing it with other sentences . His statement of "Facts are not indisputible" was used in a picnic of fraudulent attempts to discredit whatever Gould had to say.
Around here we have one of our members who used to collect lists of quote mines and present them as "how scientists (like Gould) really dont believe in evolution"
Gould was often called our "Accidental Creationist" by some folks in the Geological SOciety of AMerica. He was constantly being misquoted and this , more than anything, would frost his shorts.
Im glad you enjoyed the article, Gould was always good at his popular science writing. His texts and professional articles are more often just piles and piles of data and facts with connective tissue made from classical or baseball references.