Problem solved. I don't know why iTunes was having trouble with the redirect so I just duplicated the code on the old page.
iTunes should automatically retry the feed and download the episode within 4 hours. If you're still seeing the error message after 4 hours, please let me know.
You can manually fix the error by right clicking the podcast and selecting "Update Podcast" from the context menu.
THANK YOU everyone for reporting this and helping me get to the bottom of it!
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