Te is about epistemically straightforward and unproblematic facts. things you can more or less directly observe and/or measure
Ti is about epistemically challenging and potentially controversial facts. things that require a complex chain of reasoning/inferences to be arrived at
Se is not about facts. at all. it is about entities, objects and our way of understanding these in a holistic (= P) manner.
delta STs take in Te via the empirical method. they simply quantifyably keep track of what they observe.
gamma NTs produce Te (i.e. the testable claim) from the Ni/Se holistic model of the world. this can at times even make them averse to empiricism.