I don’t think that was the source of the difference / misunderstanding.
A law can sometimes have the effect of (imperfective) marginalizing something, and so it can sometimes achieve an end result of (perfective) having marginalized something.
But it’s very hard to deliberately, successfully frame a new law to marginalize something, because the law can’t come outright and say “this is now marginalized, by law” the way it can say “this is now forbidden, by law”.
Whether “to marginalize” means to attempt to push something to the margins or to succeed in doing so.
I don’t think that was the source of the difference / misunderstanding.
A law can sometimes have the effect of (imperfective) marginalizing something, and so it can sometimes achieve an end result of (perfective) having marginalized something.
But it’s very hard to deliberately, successfully frame a new law to marginalize something, because the law can’t come outright and say “this is now marginalized, by law” the way it can say “this is now forbidden, by law”.