An interesting interpretation, but I am for several reasons inclined to stick with the more familiar interpretation:
a. Homer gives no indication that Apollo's anger has abated. In fact, as we are about to learn, it is only the prayer of Chryses that causes Apollo to stop.
b. I don't construe [face=SPIonic]a)na/[/face] in tmesis with [face=SPIonic]w)/|xeto[/face]. I see it as prepositional with [face=SPIonic]strato/n[/face]. "throughout the encampment" very effectively conveys the actions of the god's arrows.
Often, though not always, when a preposition and verb are able to stand in tmesis, it is possible to find them combined as a compound word. I see no evidence in Middle Liddell for a compound like [face=SPIonic]a)noi/xomai[/face]
c. line 53's [face=SPIonic]w)/|xeto[/face] is meant to recall and reinforce line 50's [face=SPIonic]e)pw/|xeto[/face]. The force of the verb in line 50 is "attack". I think it is likely to have similar force in line 53.
If you seek a meaning for [face=SPIonic]w)/|xeto[/face] that involves 'leaving, departure', then see Middle Liddell defintion 3: "of things, to denote any quick, violent motion, to rush, sweep along, Il." E.g., the arrows left his bow in a hurry.
But I don't think it means "the arrows of the god departed the camp".