"Because Mexican immigrants have much less education than the average U.S. worker, they increase the supply of less-skilled labor, driving down the wages of the worst-paid Americans."

That doesn't sound like the claim you made. It is also a prima facie reasonable claim to make.

That source isn't even able to directly lay out the claim, it spends 5 paragraphs IMPLYING Krugman changed his position for hand-wavy political reasons.

But lacks any direct evidence that he actually did so. It misquotes things and really grasps at straws to make a point, holy moly.

It's so disingenuous lmao.