Hello,
Welcome @RKDTOO to the AntennaPod community! You’re not the first to wonder. Have a look here: Problem with GPodder.net (or the issue at GitHub, where AntennaPod development happens)
TL;DR - Yes, gPodder.net is down. It’s an external project and unfortunately we can’t get hold of them, so there’s nothing we can do
Cheers
Edit: there even is a discussion whether gpodder.net should be supported long term