Matt Miller is 'Strength and Conditioning Coach' isn't he? I'm sure the new super-professional Albion set up has room for more than one fitness expert.
We don't know what role he's been recruited for though. The role he had at Watford does sound very much like MM's here, but that doesn't mean that this chap would be doing the same stuff here. Might be heading up a sports science team at the academy, for example?