The Society of Biblical Literature’s book page has a helpful write-up of the Deuteronomy volume, which gives a sense of what this series is about:
Wevers [spent] most of his adult life studying the Septuagint, the last thirty years being devoted to the Pentateuch. The author considers the Greek text to be the first commentary on the Pentateuch ever written (in the third century B.C.E.) and not merely a collection for emendations of the Hebrew text. The work focuses on how the translator accomplished his task and on the vocabulary and syntax of the resulting text, rather than on either scholarly opinions on the text or how interpreters subsequently used the text. The Notes are intended for students who would like to use the Greek intelligently but are not specialists in Hellenistic Greek or LXX studies.