Windows touch devices are a device type we target.

Typically testing using Chrome on Windows using a touch screen gives you a reasonable frame of reference for how iOS and Android behave since all are WebKit-like (at least until fine tuning, when you're of course testing on real devices).

For mobile websites it would trigger the same browser events, right? Don't think they're referring to native apps.

seems to me that a touch screen laptop is a real touch device with browsers emitting (afaik) the same real touch events. as such it would seem to be better for tuning behavior compared to a laptop without real touch events. (of course it's best to have actual devices around for testing.)