He doesn't mention the word "burgh" of course and as far as I know you haven't gone blind. I stand corrected about the historical status of Motherwell and thanks for that. For much of its history though it has been connected to Wishaw. But in effect Motherwell was and is the same settlement as Wishaw, albeit with its own identity. Its part of a continuous urban area which also includes the likes of Craigneuk, Cambusnethan and Newarthill.
The area's development is similar, in some ways, to that of Glasgow which grew and absorbed villages like Partick. On the east coast, we don't normally confine Hibs' influence purely to the port of Leith which to all intents and purposes is part of Edinburgh. In the late 19th century Leith had a population of about 55,000 and I doubt if it has changed much since then given that it is surrounded by Edinburgh.
In short, my point is that you can't use artificial and outdated boundaries and relate them to football teams. The article also fails to take into account the catchment areas of football teams.