Simple anwer to this one. They do it for the house show pop it would have received. I don't know if there was any significance to Amazing Red and the location of that particular hoouse show. If there was, it would have been done for the cheap pop to please the fans in attendance at the house show. Even if there is no such significance, same reason applies.
Likely shortly thereafter, Amazing Red will lose the title back to Lethal so that by the time iMPACT airs again, or a PPV happens again or whatever, it will be like the title change never happened. Next episode of iMPACT, Lethal is champion again, and the title change never gets mentioned, like it never even happened.
Either this, or Lethal is injured or did something significant to piss off the powers that be in TNA, causing a quick title change, but I doubt it. Likely the house show pop. Look for Lethal to be champion again at the next airing of iMPACT.