... and now the joke is on YOU, brother
The engine you quoted above IS 3-stage vtec.
Stage-1: before 2500 rpms where engine operates at 12 valves.
Stage-2: 1st vtec switchover, where all 16 valves are in operation.
Stage-3: 2nd vtec switchover, intake valves operate at higher life, aggressiveish cam.
2-Stage vtec is any regular vtec engine: either a combination of stage 1 & 2 or stage 2 & 3, mentioned above.