At multiple points throughout that article they specifically mention stuff like “for now” and that they have not rules out working together again.
As I said they are on a break right now and we just don’t know how long the break will be, I would assume at least 2-3 years before we hear about anything related to a new series. One thing that has specifically NOT been stated is that Korra is the last animated series in the Avatar universe.
I get that they link an article saying that Mike and Bryan said it is the last thing, but in that article Bryan is quoted as saying
“nothing major in the works, and there probably wonâ€™t be for a long time.”
Remember Hypable are just a general fansite for the most part, Avatar just happens to be a thing they cover, they are not getting exclusive news. I have been referenced a few times in their articles as the source for certain news. They have put some bad titles on their articles about this topic and it has led people astray. They are usually fairly accurate, but on topics like this it would be much better to source a trusted specific fansite or a site getting first hand news.