Nothing credible says that, or could say that. Counterfactuals of that nature are very hard and in an election that was decided by 70,000 total votes out of over 130,000,000 it's nearly impossible to assign causation.
> We still don't really know who hacked the DNC, whether it was Russia as a hand selected group of people from intelligence agencies included was likely, or whether it was an insider as implied by Assange and security experts who looked at how fast the information was downloaded.
Nah, we know it was Russia. The CIA said so from the beginning (learned via signals intelligence), independent security firms all said the same (by attributing the C&C servers and link shorteners to other attacks known to be from Russia), and the DOJ laid out the full detail in the indictments. We even know who specifically was sitting at the keyboard (presumably via Dutch intel who had literal real-time video access). The Bill Binney nonsense about download speeds was immediately discredited -- and further discredited once it turned out that the Russians were using US-based proxy servers.
> We know Russia did take both sides on issues like black lives matter to "cause division" We know they created a "Buff Bernie" meme, but it really feels like a massive excuse by the Democrats for an embarrassing failure.
They repeatedly expressed preferences for Trump, the divisions they were trying to cause were all for his benefit. They started targeting Marco Rubio and Ted Cruz, and then eventually moved on to anything that would harm HRC, such as propping up Bernie. The democrats obviously failed to win what should have been a very winnable election but to deny Russian influence at this point is to be deliberately obtuse.
If you have any doubt at all about the DNC hack, please just read the 'speaking indictment'. There's really no question at all: https://www.documentcloud.org/documents/4598902-DOJ-Russian-...