That's a really good question. Obviously, whether you are seasonal workers, self-employed or otherwise, this particular legislation depends on you qualifying for parental benefits in the first place.
It does not solve the problem of individuals who do not qualify for parental benefits because they haven't banked enough hours or for some other reason under the current system. It simplifies the problem by saying that if you have qualified for parental benefits, you will benefit from this clause and this change. It does not address any discrepancies or weaknesses that someone might feel about what it takes to qualify for parental benefits in the first place.