Neither the Senate report nor the Mueller report attempted to determine whether the Russian operations affected the outcome of the election, as your article indicates:

> [D]id those Russian efforts actually swing the outcome of the 2016 contest? ... Mueller's report does not attempt to answer this politically charged issue.

Indeed, that article explains quite clearly how it's not possible to say with certainty ("nowhere near enough") whether the outcome of the election was changed or not. You can't compare the impact of the stolen DNC and Podesta emails with campaign expenditures.