I don't understand how that addresses campaign finance.

Even under socialism it will still be essential for the people to keep a close eye on their chosen representatives (and also other leaders such as those in the leading revolutionary party), but it will no longer be virtually impossible for those representatives to truly represent the interests of the people

How will these representatives be chosen? Well they be able to campaign and will there be a limit to how much they can spend on a campaign?

If direct democracy is what you're advocating, how can that work? Does every citizen have to spend an hour reading legislation every day then vote through an app on their phone?