The post that I was replying to was talking exactly about fertility rates of second, third and beyond generation immigrants in Netherlands. And what was found

The post that I was replying to was talking exactly about fertility rates of second, third and beyond generation immigrants in Netherlands. And what was found is that females from south-east Asia had a big drop in fertility whereas Turks continued to have large families, comparatively. So, no, the above research specifically disproves your argument.