This doesn’t seem to do the mouse position-triggered switching?

Not sure why they posted that when Level1Techs does actually have USB KM with mouse roaming. https://www.store.level1techs.com/products/p/4-port-km-switc...

GP was indicating monitor switching, which your link doesn’t do. The equivalent of TFA for monitor switching would be full KVM switching when the mouse crosses the outer screen edge.

I'm referring to the fact that it maintains an independent connection to each monitor in order to facilitate fast switching. Almost no other DP switches do this.

Is there some documentation about this somewhere? I actually own both level1techs DP 1.4 KVM 4-computer/1 monitor switch and that new USB KM switch, so I'm familiar with their products.. but I'm not aware that their KVM does anything special other than support high response rates (where most KVM's only do 60hz) and passthrough USB properly.

I'm pretty sure I heard it in either an LTT or Gamer's Nexus video - most cheap switches simulate unplugging the cable from one computer and then plugging it into the other, so the monitor has to detect the new computer and negotiate and etc, usually takes a couple seconds for your desktop to appear. The Level1Techs one maintains an independent signal to each computer so that the monitor can start receiving a video stream immediately.