Immigrants should not be treated as criminals. Seems reasonable.
It seems that closing inhumane DHS facilities is a good idea. If they are inhumane, then they should be closed. He says nothing about closing the humane facilities. Ending "for-profit" detention facilities does not open the border up (why is it "open borders" if you do not let private companies profit from detaining refugees?). Removing unnecessary barriers for refugees seems logical. We should only have barriers that are necessary. Unnecessary barriers are, well, unnecessary. Virtually eliminate immigration detention? I assume that is for refugees? That doesn't allow them to stay in the country, it just keeps them from being in a detention center. Not sure where I stand on that, but that does not make it open borders.
Open borders means that you let everyone in, period, to stay. If he meant that, he would have said it.