Here is what it all really means: nothing.
Nothing at all except that among a certain segment of our supposedly educated upper-middle-class there is apparently an endless appetite for therapy-tainment. The Mueller investigation has seemingly nothing to do with collusion between Trump and Moscow, of which there is still as much evidence as there was in January 2017, i.e., none. It’s Bircherism for people who know what “green juice” is, a way to explain how the wealthiest political campaign in history lost to a quasi-literate lowbrow TV star and cope with this ongoing reality. This is why some recent takes don’t even make a pretense of mentioning Russia. Long ago the whole thing morphed from being an investigation of treasonous election meddling to one of supposed obstruction of an investigation into the aforementioned non-event. People are still clicking.
It is easy to understand why journalists cater to their readers’ appetite for this stuff. When there is news, even news that makes the whole thing seem stupid and pointless, it’s bad news for Trump; when there isn’t news, the absence of news is also bad news for Trump.