If I'm understanding the parent comment correctly: a fact may have political implications but it doesn't depend on politics. In other words reality is independent of our interpretation of it (i.e. philosophical realism). The rub of course being that coming to know facts about most things is a highly social process filtered through interpretation and biases. Everything can be political if it needs to be decided upon by a group.

EDIT: I have avoided using "truth" here because it's a more general term than "fact" which has the connotation of being in reference to something concrete.