“You’re also about informing folks when you think they’re wrong.”
“Hoosier is the OFFICIAL DEMONYM for a resident of the U.S. State of Indiana. Although residents of MOST U.S. states typically adopt a DERIVATIVE of the state name, e.g., Indianan or Indianian, natives of Indiana NEVER USE THESE DEMONYMS.”
I just demonstrated that it’s not wrong. It’s a perfectly proper use of the English language, which is why it appeared in the paper I cited.
Show me something that demonstrates that “Indianan” is not permitted to be used.