Sure.
The idea is that if you are in a small business and you can barely make the payroll in paying minimum wage, typically you would not be a candidate for a registered pension plan. You would not even offer a group RRSP, or you might where it is only employee contributions and you administer it on behalf of the members.
So the supplemental CPP would allow those types of companies to say that they, the employers, would not contribute anything because they just don't have the money, but that they would collect whatever contributions the employees want to make. Instead of putting the contributions into their personal RRSPs, the employees would put them into this plan and the employer would collect them for the employees and remit them to the Receiver General. They might also reserve the right, if they have a good year, to voluntarily pay a bonus into those accounts as a bonus from the company.
There are plans out there called deferred profit-sharing plans that work roughly along those lines. This supplemental CPP reform is flexible enough to allow that type of structure as well as the ongoing regular contributions.