No need for a new thread.
Different podcast-consumption apps use different sections from the podcast RSS feed to display descriptions. This is frustrating but it can't be avoided. (Even Apple does this between the desktop iTunes application and its iOS Podcasts app.)
There's a couple things you can try if the goal is to keep the entire blog post from showing up as the podcast description:
1.) Go to PowerPress >> Settings, Advanced Mode >> Episodes.
2.) Check the box next to iTunes Summary Field and click the Save Changes button at the bottom of the page.
This'll create an iTunes Summary field that appears within the Podcast Episode box. Your client can enter the desired episode description there and that'll show up within some applications instead of what's in the main blog post.
Also:
1.) From the WordPress dashboard (not PowerPress) go to Settings >> Reading.
2.) Switch the "For each article in a feed, show" option to Summary and save the changes.
This changes the behavior of how RSS feeds work within WordPress (including the podcast feed) and may produce the result you're client is looking for, regardless of whether or not the iTunes Summary Field option described above is in use. You may want to actually try this one first.