It doesn't work for that group of people, for sure.
The thing that strikes me, too, is that our understanding is that the new rules were intended to help lost Canadians gain citizenship and to stop people who don't have a commitment to Canada.
The only thing I could think of with adopted children was that perhaps there's a fear that older children would be adopted into Canada for convenience reasons. That's the only thing I could get my head around.
The issue with that is that in order to adopt a child you have to demonstrate a genuine parental relationship. So in fact, those children are not being allowed into Canada for that reason. It doesn't make any sense. There are very few older adoptees.