A Mueller investigation with different parameters would have reached very different conclusions.
Mueller did not exonerate Trump on the obstruction of justice charges, but that's not what this thread is about, we're talking about Russia.
Mueller repeatedly and specifically said he was not investigating Trump on any criminal charges since he was bound by the opinion of the DOJ that a sitting President cannot be indicted and therefore there were no charges that could be pursued, even if Trump shot someone live on TV.
The New York Times article headline itself said "Mueller Finds No Trump-Russia Conspiracy". This is not some fringe conspiracy theory here. Don't get your news from Reddit.