I wonder, is this because they can't scrape the site anymore? Is it a deliberate move? Or is there some other effect?

This Emil Kirkegaard guy (the author) has a bachelor's in linguistics, and helped create a journal which does little more than churn out sudo sciencentific race science. Emil has a huge selection bias which he brings to the table in order to satisfy his user base.

The comments for this article are particularly telling. People repeatedly saying, "they'll never accept the evidence." "The Chinese results are just selection bias and will fall behind the whites"