I would say that on a very short runway like that, an ILS is an instrument landing system, an instrument approach that is typically not used as much by general aviation aircraft to the same extent as other aircraft landing on those very short runways, so there may not be a business case for it.
I don't have specifics on that aerodrome in question, but I'm sure that if we could get the specifics of that particular aerodrome, we could get back to the committee in a timely fashion with the response.