Earlier quoted context omitted.
There’s a lot of money in real estate. It’s better staying in the country than going to Chinese firms. If it makes no difference to you, why not favor your own country?
Because I am a committed internationalist and believe that national borders are the greatest moral atrocity that exists today.
I think this a fairly superficial claim. I agree that there are reasons to question the moral basis of national borders (why should someone be given additional rights based on where they were born?) but there are immense practical benefits that arise from having national borders. From a utilitarian perspective, these practical benefits likely outweigh the costs.
In the case of placing additional taxes and restrictions on foreign investment in real estate - yes, this may restrict the freedom of foreigners, but the overall benefit of these laws could be sufficient moral justification.