They are mistaken.
Take, for example, the Québec Parental Insurance Plan, the QPIP. It is probably the only social program that had the courage to do that after the 1990s. Since 2006, self-employed workers have been automatically protected under the program. They pay a premium, sort of midway between the total of the workers' premium and the current employers' premium. You can consult the figures on the Québec Parental Insurance Plan. I have them with me.
The CFIB is wrong when it says that employers will be paying for self-employed workers. That's wrong. Look at the QPIP; it works well.