What a nonsense. I would suggest you learn what modern philosophers are doing. See here.
Using your argumentation scheme, I could say that physics is dead because Newton got overruled by relativity and QM.
Or the other way round, that what Newton did was philosophy, not physics: his main work was titled 'Philosophiæ Naturalis Principia Mathematica'.
Both are nonsense of course.
And, btw, saying 'philosophy has had its day' is a philosophical remark.
That is highly frustrating. Often I give up when such a thing occurs...
These are of course not independent. And I think I do not know of a 'philosophical methodology' that is also not used in science: logic, valid proofs and argumentations, clarity of concepts, striving for consistency, for unifying theories etc.
1. 'Premises' in philosophy are found the way we think. That needs a kind introspection ("Why do I assume this is true? How did I come to the conclusion this is true? Wa