> This is a philosophical argument, therefore dismissible by science.

The claim I just made - that dismissing philosophy on empirical grounds is self-refuting because it relies on the philosophical position of empiricism - is not “dismissible by science” - there is no experiment or observation capable of proving or disproving that claim.

Also, the assumption you seem to be making - that all genuine knowledge comes from empirical science - can be countered with the argument that mathematical theorems (e.g. those of Gödel) are true and can he known to be true, but they are not known or knowable by means of empirical science

> Unless you can rephrase your argument as something testable, it's philosophy and thereby not relevant.

What you just said is not testable, hence by its own terms is philosophy and thereby not relevant - it condemns itself as irrelevant

You're missing the point - your claim of "hypothesis has to be testable otherwise can be dismissed" is itself philosophical (philosophy of science). You're claiming that your claim can be dismissed.