Yep. The idea isn’t to make anything actually stick against Mueller beyond the first week of November. If they can motivate true believers and persuade enough casual consumers of ‘news’ with a baseless smear, it’ll have an electoral payoff for a relatively minor investment.* They seem to be willing to risk the consequences when the plot falls apart later on.
*Monetarily, anyway; looks like a couple clowns will face some criminal charges.