I think you need to re-read the article. The point is that firers will (more often than not) miss what they are aiming at under battle conditions. With a single shot weapon on the range, a firer might have a group of 100mm, which will hit a head sized target most of the time. However under battle conditions they will miss that target most of the time. However teaching them to put a round through a 1m square aiming point every 3 seconds is more achievable and efficient. Putting 10 rounds through that 1m square doesn't give additional effect, and (with a single shot automatic weapon) probably wont happen, as to get that rate of fire aiming goes by the board completely (ditto LMG bursts). I think the point is that suppression is best achieved/sustained by slowing the rate of fire and holding consistent aim points. A single rifleman (auto rifle) can probably keep suppressed one target at 1/3 rd per sec which is much better than firing a much higher number of shots over a wider area. More realistically a team can suppress 2-3 m of linear position for a long time if controlled properly but if not will run out of ammo very quickly and not achieve measurable suppression.
The article is indeed very positive to a device sold by the organisation assisting the writer, but that doesn't make it wrong!