Swamp coolers always work by displacing the indoor air with outdoor air, if they recirculated indoor air they would drive the humidity up until they were ineffective (one pass through my cooler already puts the indoor RH at 50-60%, vs. about 10% outdoors). The difference is that, in addition to replacing indoor air with outdoor air, a swamp cooler can also use evaporation to cool the outdoor air so that this is effective even when it's warmer outdoors than indoors. This does mean that you have to have windows open for a swamp cooler to function... visit a house in Albuquerque and the combination of swamp coolers and crime mean that you'll see window iron or wooden props everywhere so that air can go out without burglars coming in! The blowers in swamp coolers are powerful too, often producing a constant indoor breeze. Mine slams doors if I'm not mindful.
A normal practice for cooling is to run the blower when outdoor temps are lower than indoor, and then both the blower and pump when outdoor temps are higher. Thermostats are available but not very common on swamp coolers, one reason is that independent control of the pump and blower makes them a bit more complicated than an "on/off" behavior, and another is that they take time to displace the indoor air so they work best if you anticipate the daily trends by cooling the house farther than target before temps really climb in the late morning. During weather like we have in Albuquerque right now, lows in the '70s and highs in the '90s, you will run the blower 24/7 but might stop the pump when the house gets cool enough.
I've thought about it a bit and I can't really see how what's described in the article is different from the normal "best practice" for swamp coolers - bringing in outside air, with or without additional evaporative cooling depending on the outside temperature. He refers to the advantages of closing up the house to retain the cool air, but if that's sufficient (and it is for a while in spring and fall) you just turn off the swamp cooler and close the windows during the day, no extra hardware is needed.