Brahmas at formless realms are unable to hear the teachings of the Buddha

Why Brahmas at formless realms are unable to hear/communicate/understand the teachings of the Buddha when they have high intelligence? > Alara Kalama is wise, competent, intelligent. He has long had little > dust in his eyes. What if I were to teach him the Dhamma first? He > will quickly understand this Dhamma. > > [MN 26](https://www.accesstoinsight.org/tipitaka/mn/mn.026.than.html) I mean not just Alara Kalama but other Brahmas still living there? Like the deaf in human realms which much lower intelligence still able to learn? This is relevant to Form in the formless realms and The difference between Arupaloka and Nibbana