You are using a YouTube link with @handle instead of channel_id. To activate RSS feed support for URL click on the Convert URL link.
@handle
channel_id
The name is used to identify this specific task.
Enabled
Whether the task is enabled.
Auto Start
Whether to automatically queue and start the download task.
Enable Handler
Tasks without a supported handler must use a timer.
Archive All
Mark all existing items as downloaded after add.
--download-archive
Command options for yt-dlp
playlist_id
.rss
.atom
&handler=rss
#handler=rss