So a cryptographer dismissed this result and the police aren't looking at it. Third or fourth time someone's cracked this, this year. Why is this special? Seems he took a lot of assumptions.

Forgive me. But I've seen Glenn Beck and Jon Stewart (satirically for Jon) make ridiculous connections using numbers. That's what I saw when I read, right after the Virgin Island 340 area 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.

Also, is the message decoded supposed to look that nonsensical? What did the other Zodiac decoded messages look like? Were they more coherent?