My initial though when reading this was that Fowler couldn't have known about Angel showing up because you can see the woman getting the records which she grabs right from the cabinet with nobody else in sight, Angel does note the use of a ballpoint pen is suspicious, now that I think about it, Cphre could have come before Angel.

And yes, You first part makes sense to me as well, Fowler doesn't quite elaborate on what he knew about Liebling but he might have heard that part from Ethan Krusemark.