I'm gonna drop this here because everyone else is talking about it.
Scanning SWATH goes way back to almost the beginnings of SWATH as an idea. I think it is very similar to SONAR from Waters in that the quad is not a stationary bin like we use for quadrupole Orbitrap based DIA.
The trick here is fully on an informatics level, executed through the impressively easy to use DIA-NN software.
There was an informal ABRF wrap up meeting with a lot of smart people from around the world that I somehow got invited to and one thing we talked about at length was the new generation of LCMS software that doesn't give you easy access to MS/MS fragments. DIA-NN falls in that group. This isn't going to make everyone comfortable, but it is something to be aware of. There is a whole generation of proteomics people using new software and getting stupendous numbers of identifications that verified by software but are not (or at least, not easily) verified by checking to see that MS/MS fragments actually exist.
If the software is right? Who cares! If the software is wrong, for many of these tools I don't know how you ever find out. I've been trying to look at the RAW data from this study but MSConvert won't recognize the .wiff.scan files and I'll probably just assume the reviewers did their due diligence on this fantastic sounding study.