They're a target of the US Empire and folks that can't do media criticism gladly take the bait.

The first rule of propaganda is emphasis, which is what you're astutely picking up on. Why are stories about X and not A, B, C? When they're about X, what context is emphasized, what is fact and what is allusion, who is interviewed and given the opportunity to comment and who is not? "World news" stories are very frequently just stenography of various think tanks, often ones that are more or less in agreement with one another.

The entirety of China's actions reported in this story are that China (exactly who isn't stated, not even a group) invited an AfD delegation to meet with them. No source is cited, but maybe it's Weidel. From this they create an entire narrative by retelling past articles about AfD's foreign policy statements and ask one person to comment: "political scientist Wolfgang Schroeder from the University of Kassel". They don't mention that he's also an SPD politician and associated with a government-funded research institute with a dodgy past. Maybe his takes are good, but why they asked him and not others isn't stated, of course.

This is just folks getting easily hoodwinked by a propaganda push. Same as folks were suddenly very concerned about WMDs in Iraq or the political powers in Afghanistan and so on. They weren't, not organically - a network of think tanks, government stooges, etc all rally to provide jobs for these kinds of nerds to write these kinds of articles and have these kinds of takes. Several think tanks in Washington have converted from focusing on Syria or Iraq to focusing on Russia or China, as they know who butters their bread.

Anyways that's a long ramble in response to a simple question.