They don't have access, and it's either because they aren't eligible—they don't have the insurable hours—or because of the employment standards legislation, which has minimums in some provinces. In some provinces you need to have worked a year with the same employer. Let's say you accumulate your 600 hours but then you move jobs and you're working in another place. In Alberta, for example, you need to have at least 52 weeks with your employer before you can claim the benefits.
There are issues of being eligible but also of being able to actually claim the benefits. That makes that number higher.