Seems to have links to, and 1-sentence descriptions of, all of their articles.

This isn't very useful if you want your RSS reader to pull down articles for you to read while you're offline. For that to work, you want the feed itself to have the full text of every article embedded inside it.

It has the full content. See view-source. Firefox hides it.

I mean article content, not just the first line or the title. This way articles are cached in case of downtime.

For some reason Firefox is only showing the <summary> contents when you click that link, but it's all in there and it shows the full article in ttrss for me.