That list refers only to CAI training firms with current vacancies. As such it is merely a small subset of the CAI firms in Co. Kerry.
I would always advise against choosing a professional service provider at random or from a directory. If at all possible, get recommendations from friends, family and colleagues. If all else fails, and you don't have any recommendations to hand, find out as much as you can about the firms concerned, including (but not limited to) their websites. Then make your selection after talking to 1 or 2 of them.