I wasn't aware that he put a "2005" deadline in his prediction. Taking this into account, he probably wasn't wrong actually, at least in terms of net impact: in 2005 most of the moderate positive economic impact of the internet would have been offset by the significant negative economic impact of the dot com bubble and subsequent crash.
"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.
Do you have evidence of this claim?