Karl Alex Mueller's intuition was that the nature of mobile charge carriers in manganates and nickelates should be like those in cuprates, which he believed were Jahn-Teller polarons, so he expected them to also host high-temperature superconductivity (HTS). Following his suggestions and persuasion, in the past, we performed several experiments that included atomic-layer-by-layer synthesis of novel, metastable manganates and nickelates. Despite our efforts and several USO ("Unidentified Superconducting Object") sightings, we failed to find any reproducible superconductivity and dropped the project fifteen years ago. Our results are presented here, for the first time — timely, since HTS was very recently discovered in nickelates (under pressure). So, whether his opinions were on the mark or not, Alex did guess it right — again.