Any story about threats by the Internet to democracy that revolve around Twitter has to account for the fact that only a minute portion of the electorate ever looks at Twitter.
Besides, even if it was just about twitter, it can only take a small portion of the population to swing an election. Word of mouth is also downstream from twitter. People might not see something on twitter, but they might hear it from someone who saw it there.
I like to think that I am not alone in this and this happened to hundreds of thousands of people. When you overly optimize for engagement at some point you cause burnout and loss of interest. It felt funny seeing musk claim that all twitter statistics were going up without realizing the cost of it. Social media has to strike a very strong balance to keep you engaged, but not too engaged.
If you believe Biden’s election was stolen, you are likely to have that belief reinforced by low-quality media targeted at you.