The feed is technically OK, and can be subscribed to manually in iTunes, so we're back at the answer I originally gave.
However there are a couple of points you should address. Some of your filenames have spaces in them: although the feeed has handled this correctly by substituting the code %20, so that it's not actually causing a problem, it's bad practice and better avoided. The usual workaround is to substitute an underscore for each space.
Regarding the second oldest episode, I should change that title if I were you. Despite the way you've laid it out it's quite obvious what word you are referring to and it's likely to get you rejected. Even if you set the 'explicit' tag to 'yes', explicit language is not allowed in titles. You might get away with this, but I would expect the risk of rejection to be high.