It’s probably more accurately described as extortion phishing. With blackmail, I think you actually have to have damaging information that your withholding in return for payment (or other benefit). But this is clearly a non-tatgered phishing attack sent to many individuals in the hopes of extorting a payment, without the sender actually having anything damaging on the recipients.
Could have just been injured. Electrocution doesn’t always mean death.
According to Miriam-Webster, the definition of electrocuted is: