The idea with low-temperature (<220F) "smoking" is that:
1. the meat heats up slower so has more time to absorb the smoke
2. meat moisture is very slowly leaving the surface from evaporation at temps<212F
2a this keeps the meat moist longer
2b smoke sticks well to water because a water molecule is highly "polar"
3. the meat bulk is staying under the 120-140F temps at which fats melt and drip out
3a. An oily surface does not attract smoke well
3b the smoke diffuses better into the meat before that fat melts
Many believe that once your inside temperature is >120F, more smoke is just wasting time. Take the temperature way up and get the cook over with (ie reach your final desired inner temperature.)
But I agree that recipes like you're reading are almost certainly referring to "pellet grills" which have traditionally come with a Cook Mode (which is thermostatically controlled to a set point by feeding fuel pellets as needed) and a Smoke Mode (which is based on slowly feeding pellets at a fixed timing rate and thus leads readily to temps <200F.)