From what I understand of the story it started with an email sent to internal activists explaining why there were some performance issues with internal campaign

From what I understand of the story it started with an email sent to internal activists explaining why there were some performance issues with internal campaign tools. The attack was just a DDoS but once it hits the press it takes on a life of its own. Simplified technical details for a non-technical activist base get used to create a story, it's interesting to see how the sausage gets made but other than referring to the government body for cyber attacks as a matter of protocol I don't think there's much to it. As an aside Labour really do seem to have a pretty good technical team. Both the party and the loosely affiliated activist group Momentum have built a variety of campaign tools which have helped organise and mobilise large canvassing efforts. I've been impressed by what they've managed to put together. It sounds like they shared ideas and expertise with Bernie's campaign team in the US when it comes to building these tools.