No, Russian interference allegations were confirmed through other means, mainly human intelligence and other types of intercepts.
The dutch even filmed the meddling operations through GRU hacked security camera.
I don't see how the Dutch story is relevant, if it's the one I looked up, and it sounds therefore like there is at best circumstantial evidence. Even motive isn't very reliable because all kinds of people are out to do things like influence the elections.
It is intelligence, not "at best circumstantial evidence". And no, "all kinds of people" did not have the same explicit motives highlighted by the Muller Report, the Senate Committee, or 18 US intelligence agencies showed.
I guess spitballing theories on hn is always more accurate than thousands of analysts sharing this analysis in Western countries.