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> It uses several techniques for this, of which the most notable is that it takes advantage of the priority queues provided by modern switches.

I'd understand if they said routers, but switches? Do L2 switches have any notion of priority and if yes how does it work?

Typically you map a VLAN to a priority via PFC (Priority Flow Control). You can do it with vconfig on Linux. Switch OSes have their own CLI for this.

Some switches can do PFC for untagged packets. They classify based on DSCP, and map that to a PFC priority. I've never used that though.