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Becker (2019) argues that the LBMS is a structural change. It is initiated by the phonetic movement of BOT, but does not require completion of the Low Back Merger.
We ought distinguish structural changes from phonetic drift. A structural change is one in which the system of contrasts in the language changes. A non-structural change is when the phonetic implementation of a contrast changes without a change in the contrast itself. It's not clear that this is what Becker (2019) means by the term "structural".