Same day registration. One ward in Milwauke had 202% turnout. By a rough estimate 500 out 640 existing voters showed up and mostly likely voted mainly for Trump. At least 700 brand new voters showed up, filled out the paperwork claiming to be from that ward, then voted (very likely) mainly for Biden. Biden won the majority. The ballots are all mixed together. Even if the registrations are fraudulent, their votes cannot be separated out.
The Red State author should at least mention same day registration. Otherwise he is leaving out important information about the most likely type of fraud.