You're literally arguing that a government intelligence agency couldn't find a couple of experienced people, provide them with commercially-available equipment, and get them to coordinate a medium-complexity task.
Yes, it's an operation that requires coordination and planning, which is why it's reasonable to assume it was carried out by an intelligence agency and not a lone fisherman with a grudge. But once you're in the realm of intelligence activities, this isn't exactly the "let's blow up their pagers" level of complexity.