Nope, you’re cherry picking. Muller didn’t establish that because he didn’t wasn’t allowed to go further. Here’s the complete paragraph of that very quote:

"As set forth in detail in this report, the Special Counsel’s investigation established that Russia interfered in the 2016 presidential election principally through two operations. First, a Russian entity carried out a social media campaign that favored presidential candidate Donald J. Trump and disparaged presidential candidate Hillary Clinton. Second, a Russian intelligence service conducted computer-intrusion operations against entities, employees, and volunteers working on the Clinton Campaign and then released stolen documents. The investigation also identified numerous links between the Russian government and the Trump Campaign. Although the investigation established that the Russian government perceived it would benefit from a Trump presidency and worked to secure that outcome, and that the Campaign expected it would benefit electorally from information stolen and released through Russian efforts, the investigation did not establish that members of the Trump Campaign conspired or coordinated with the Russian government in its election interference activities. "

So even if there was no direct collusion, there sure as hell was a deliberate campaign by Russia to support Trump. The only thing Muller was blocked from establishing was if the Trump Campaign was talking to the Russians directly, or if Russia merely saw a Trump Presidency as being in their interests and worked on their own. Again, Muller was not allowed to follow up any deeper than he did.