Once you've submitted your RSS feed to any platform (Spotify, iTunes, Google podcast), you just have to wait for the changes on RSS.com to sync with the platform. 

Podcast platforms typically syndicate your RSS feed several times per day. It is possible sometimes that your recent changes take a few hours to appear in all the podcast directories. 

In some cases, a previous version of your data may be stored in the cache of your device. For this reason, you may not see the updated changes. In these cases, we suggest you clear the cache of your device to be able to see the updated changes.