FYI; the paper is clearly a reference to Danijar Hafner's 'Dreamer' line of work, which was published in 2019, and which Danijar has continued to iterate on. https://arxiv.org/abs/1912.01603

The TalkRL podcasts on this line of work are reasonable accessible and quite interesting. https://www.talkrl.com/episodes/danijar-hafner https://www.talkrl.com/episodes/danijar-hafner-on-dreamer-v4...