The article from The Intercept (which I have never heard of) contains a diagram of the supposed connection to the “GRU” which is supposedly the Russian government spy agency. The diagram says a green line connects parties based on “confirmed information” and a yellow line connects parties based on “analyst judgement”. There is a yellow line between the GRU and the source of the supposed hacking. So this whole article is saying that someone has a hunch about a connection to the Russian government. So it is speculation, why is this news? More likely this NSA document is a fake which was intentionally leaked to this “Winner” to see if she would make it public, and she did.
https://theintercept.com/2017/06/05/top-secret-nsa-report-details-russian-hacking-effort-days-before-2016-election/
The winner here is Trump, as usual.
FYI, the GRU is Russian (and former Soviet) military intelligence (DIA plus Army, AF, Navy Intel)...as opposed to the NKVD / KGB / FSB...which is the civilian (CIA) version.