@hightor,
I believe the NYT article you linked is simply a contrived distortion of the truth. It is evident from the content of Mueller's report that his two-year investigation was focused only on elements of potential Russian interference in our election that might involve President Trump. They completely ignored or left uninvestigated other rather obvious potential sources of Russian interference. Despite its obvious focus on finding only Russian interference involving President Trump, the investigation found no probable cause conspiracy or even collusion involving the president or his campaign staff.
Very significantly Mueller exerted no effort whatever to inquire about the sources and origin of the dossier produced by former British Agent ( and then a freelance agent for hire in Russia) Tony Steele, and paid for by the Clinton Campaign. If the central concern was that of Russian interference in our election, then this dossier was, quite obviously, itself a front rank potential source of it. However instead of investigating the sources for this, now discredited, political hit piece as itself a potential element of Russian interference, or even verifying some of its contents, the anti Trump cabal in the FBI misused it to get FISA court approval for unlawful covert surveillance of the Trump Campaign communications.
The bias of the now discredited leadership team in the FBI is now clear, however it is difficult for me to conceive how Mueller could have simply let this glaringly obvious potential element of direct Russian interference in the election simply be ignored in a lengthy two year investigation.
It is also remarkable that the contortionists on the NYT editorial staff are exercising so much effort to describe the investigations finding of no Trump collusion or conspiracy as somehow the exact opposite, while at the same time, ignoring the glaringly obvious omissions in an investigation that, despite its charter & title, was focused only on Interference that might involve the President.