Here, the Bible is not used as a source for "real life events" but as a subject of study by itself.

The fact that the Bible's text evolved due to cherrypicking and modification is precisely why the "concept of forgery" is important.

History is kind of pointless when you look at something that is unchanged through time. What matters is which change happened when.

The goal is to retrace the history of what the biblical texts used to look like. And undetected forgeries undermine this work.