That the podcast feed format is XML based is an insignificant detail - and a remnant of the past, nobody cares about.

People upload their podcasts to a platform like Apple Music or Spotify or Substack and co, or to some backend connected to their Wordpress/Ghost/etc) and it spits the RSS behind the scenes, with nobody giving a shit about the XML part.

Might as well declare USSR a huge IT success because people still play Tetris.