In San Francisco, a resolution was passed allowing undocumented residents who had children to vote legally in school board elections and no one voted. My guess is that even if officially invited to vote, an undocumented person isn’t going to just give the government their name and address. So yeah, Republicans are just conjuring up yet another conspiracy theory to rattle what they themselves call “low information voters”, aka their base.
Everyone needs to vote to cover “the margin of shenanigans” that undoubtedly will arise in swing states and to ensure a popular vote so high that a certain crybully will cry harder.