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It says nothing about repeatedly playing the same mission...forever if they can get away with it - which is what farming is.
...finding and repeating running missions without completing them for what they perceive to be the best "Bang for the Buck"...
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I'll take exception to that, as I do farm (mostly on one of my 50s, but also on my mid 20~30s types), but I finish my missions, because (as you mention) there's the XP/Inf bonus. In most other games I've played the CoX farming definition is just flatly impossible, due to lack of constant instancing, but there are still farmers.
I farm soloing by getting one of the "Endless repeater" contacts (or the radio/paper) and running effectively the same mission over and over and over, then when I outlevel them (or if i get bored with aliens/roman traitors/whathaveyou), I move on to the next repeater or zone, or thanks to the MA, I can run exactly the same mission repeatedly, finishing it every time (yeah, no xp/inf, but tickets work just as well). With the non-MA stuff I guess I lose a little time traveling, but thanks to calling the contact and usually playing in a smaller zone (ie. not the shard or RWZ most of the time) I can frequently get the same doors for many of them.
It should be noted that I'm a wanderer by nature, but I occasionally find some build or goal I like and manage to focus enough to do the same things or play the same character for as much as a couple of weeks at a time.