Wouldn’t opposite mean you listen at sub 1x speed.
Whereas as your definition seems to be ”I’m the same, but less so.”
Sure you can "learn" something from a Sports Podcast or a Comedy Podcast, but you could also say you are "learning" from a podcast which just reads out random numbers. You could "learn" at 33 minutes, 11 seconds, the number 6 is read out, then 8, then 1 but I wouldn't call that learning, or at least its pointless learning.