Zodiac Killer's Code Deciphered?

Hobbyist codebreaker Corey Starliper claims to have broken the Zodiac Killer's 41-year-old code. If he's right (and this isn't just a case of confirmation bias), this confirms that long-time suspect Arthur Leigh Allen was indeed the Zodiac Killer. (Via)

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  From Foster City Patch: "So that's what I started with, said Starliper. I thought, there's no way & that Zodiac is going to be prosaic enough not to mention the U.S. Virgin Islands in this code. This is where it gets even creepier. 3+4+0=7. Right. So you get 7+0=7. 707&707 are the area codes for Vallejo, Napa, and Solano. So I figured, why not start this with Caesar code using 3,4.
  
  Caesar code is a substitution type cipher where an encoder has simply replaced each letter in a message with the letter that is three places further down the alphabet."

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