Did they? Did they consistently claim for months that Russia actually *changed vote tallies*?
Of course they didn't. Del Tachi is "carrying water" right now.
The Russians did a lot of their dirty tricks on their own by stealing emails from Trump's opponents and giving them to anarchists to publish them in a way that would give the opposition campaign continuous negative news coverage. They did not actually physically change a single vote once they were cast. Trump's campaign tried to hire Russian intelligence for opposition research and Trump at least constructively knew about it but the Trump Campaign wasn't able to directly hire the Russians to do what they did on their own anyway.
So no. I don't believe 2016 was stolen but I do believe what happened afterwards was appropriate.