He's actually kind of butthurt that his toy project has already been ripped apart and replaced by competent engineering.
https://twitter.com/dan_abramov/status/691321125519753216
(Notice how his post has nothing like information or claims, just "muh feelz")
I wouldn't exactly call it incompetent, it's essentially replaced most every competing flux implementation out there, and I really don't think cycle.js is replacing it anytime soon.