I didn't say that Dems are necessarily getting information from a broad range of sources. I did say that people who get their information from a broad range of sources are more likely to vote for Democrats (there have been several studies on this recently).
Facts are, and still remain, facts. They're not subjective, belief isn't fact, and this isn't tribalism. We're no longer talking about political bias in the same way we've traditionally analysed media coverage. This is about a colossus dedicated to pushing out a constant fact-free narrative.
There's a difference between things being omitted, which can be bad and affects both sides to some extent - i.e. If you were to only watch Fox News as your sole source of information, you would have literally no idea that General John Kelly, Trump's former chief of staff, said that Trump had praised Hitler and that he believed Trump fit the definition of a fascist. I'm sure there are things that could fit into that framework on the other side if your only source of news was MSNBC.
But that doesn't touch the deliberate dissemination of outright falsehoods and lies. I don't know how much time you've spent on X in recent days, but it's a cesspool of lies and disinformation. One very small example: on election night, when Trump thought he was going to lose, he was sending out stuff on Truth Social that there was voter fraud going down in Philadelphia and the police had been called, forcing the Philly police to issue a rebuttal saying it wasn't true. Musk amplified Trump's statement (using the algorithms he's manipulated so his tweets are pushed out many more times than other people's), but never amplified the police response. So large numbers of people who don't get their news from a broad range of sources, or who don't fact check their information, have no idea this was a false claim with no apparent basis. Had Trump lost the election, they were being primed to believe it was fraud. Multiply situations like this times a million, and that's what's happening over and over.
I do agree that the far left is also distrustful of mainstream media and often aligns with the far right.
I'm not sure if you're American (I am but live in the UK), but I suspect if you're not, you don't really fully understand the extent of the problem.