It's sad that soooo many people "know" what Mueller found, when all the damning stuff was redacted. It's also sad that sooo many people think the only job Mueller was tasked with was "Russian collusion". He was tasked with finding any and all Russian election tampering, Russian collusion and to follow ANY OTHER CRIMINAL ACTIVITY DISCOVERED THROUGH THE INVESTIGATION. So yes, while investigating shady people he found more shady activity outside of collusion and election tampering.
It is unwise to state that the redacted lines and Mueller investigation found no signs of collusion. It is just as unwise to conclude they did. Patience.