The ban that the author seeks to have applied nationwide is not actually attempting any sort of regulation on the "breeding" side of things.    Which is why there is little attempt to distinguish breeders.

The ban is a ban of sales of pets at pet stores.     With the feeling that the lack of this retail outlet will then kill the market that supports puppy mills, etc.

That would not make it illegal to sell a newly bred pet anywhere.  It would just kill the "impulse buy" factor of seeing an adorable little face, and taking it home without thinking.      You could still go to a breeder and get a pet.   

But if you went to the breeder, you'd have to find them, and do research. You'd have to have thought through being a pet owner.  And if you went to a breeder and found wildly inhumane conditions, you probably would not do business with them, and may report them.

And if you bought from a reputable breeder, they might make sure you knew what you were getting into.