Consider facts which are necessarily circumstantial or evidence-based-sans-evidence. In the former case, the fact will change based on circumstance and, in the latter, one does not know a fact. “Knowing” is an area of philosophy called epistemology: https://en.m.wikipedia.org/wiki/Epistemology.
No clue about the “alternative facts” quote but that sounds a lot like “facts which I would prefer to believe” and was perhaps rightly condemned (from an epistemological perspective). Note that “alternative” does not mean the same thing as “changed” or “updated”.
As far as “changing or updating facts”, think about what this statement means at each hour of a 24-hour period: “It is currently daytime.”
No clue about the “alternative facts” quote but that sounds a lot like “facts which I would prefer to believe” and was perhaps rightly condemned (from an epistemological perspective). Note that “alternative” does not mean the same thing as “changed” or “updated”.
As far as “changing or updating facts”, think about what this statement means at each hour of a 24-hour period: “It is currently daytime.”