Mecurio's Cataclysm Multiboxing Macros

[Bollwerk]

Here is why it is better than just casting Arcane Missiles whenever they proc: Arcane Blasts put a stacking increase in arcane damage of the next arcane spell cast (up to four) that is used up when Arcane Missiles is cast. This buff also increases the mana used for each Arcane Blast. To optimize for max DPS, you'd just chain-cast Arcane Blasts, meaning you'd be at the max damage buff for all casts after the first four, but you'd run out of mana very quickly that way.

http://elitistjerks.com/f75/t106141-...pdated_4_01_a/
Seems to indicate -
Arcane Blast no longer buffs the damage of all Arcane spells. Instead, it only buffs its own damage. The Arcane Blast stack still stacks to 4 and is still cleared with the casting of any other Arcane spell.

Are they wrong?
I haven't really taken the time to test this.