Sure. Deceivers' wording is as follows:
Common enemy Units that begin a turn adjacent to this
Deceiver cannot move or attack during that turn.
The key words are bolded. This means that the Deceivers' ability kicks in at the start of the turn.
Chant of Negation is played during the Event Phase. When it is activated, it negates the abilities of all enemy Units until the beginning of that player's next turn.
Now, for the semantics. The Deceivers have what I like to call a triggered ability and a lasting effect, similar to Event Cards.
1) At the beginning of the JE turn, STUN triggers. The affected Units are now stunned, and they cannot move or attack.
2) During the Event Phase,
Chant of Negation is played. This gets rid of Stun, or more specifically, STUN. The effects of STUN are lasting, however, and so for the rest of this turn, the stunned Units can't move or attack.
3) At the beginning of the
Benders turn, STUN would normally trigger, but the
Deceiver has no ability.
4) This is key. When the Jungle Elf turn starts,
Chant of Negation's effect will now wear off. But STUN requires the beginning of the turn as well, so when
Chant of Negation wears off, STUN can't trigger until the
Benders' next turn!
This is what Phoenixio means by that ruling; it's just a step-by-step process into the workings.