As I've said in previous threads (and blogs) I'm not particularly fond of CLIA at all.
One major factor is they have no ability to regulate the travel agent industry. You can stumble on the worst, and most unscrupulous agent in the world, and CLIA has no ability (or interest) in assisting the consumer.
They are clearly a marketing association!
However, the training they do for agents to get their accreditation, does require them to have at least been on a minimal number of cruises; and more cruises are required to become a Master Cruise Counselor.... so it's at least an initial starting point. Better than talking to some agent who has never been on a cruise.
And that is why the other questions for people to ask prospective travel agent are important follow ups, after ascertaining their level of training and experience.