Not entirely; read the guide, it refers to how to protect your radios. Concerning your financial accounts: "Will records of savings and investments disappear?" You bet! Keep hard copies of all your current important documents, which will make recovering your records by the banks, etc. easier. BTW don't expect your insurance to cover any damage or other casualty losses you may incur. (Act of war, terrorism clauses)
Unless we're talking about a nuclear detonation in low earth orbit, which is clearly beyond the means of any forseeable terrorist organization, EMP effects will be localized and shouldn't be a problem outside the immediate area of the blast. Financial institutions maintain (or at least are supposed to maintain) offsite archives and should be able to reconstruct their data. But it may take a very long time to get access to your money.
I would be more worried about secondary economic effects. A nuclear attack on NYC, for example, would have a chain reaction effect and could lead to a nationwide, and perhaps worldwide, depression.