I've some experience In this field, the job title will likely the reflect the practise of working in research, analytics and insight though the application of that role could be focused on the football side of the club, the operational side of the club or commercial side of the club. This is why we probably are seeing a few clubs with similar job roles but probably different areas of focus. If hes recruited by and working for Lange, assumption is he will be supporting the football side of things.
It's also quite possible that villa already have some people focused in this area and they will be consolidated under the new recruit. This is quite normal at the moment, lots of organisations bringing in chief analytics officer roles.