That's exactly how it is! After months of Rubin aggressively trying to push his fork, one day (after much thought) he came up with another idea! Namely that his first thought was not the right one and that no change to Bitcoin was needed! Maybe it's due to his youth or lack of experience - or both - but this behaviour has been seen time and again from some developers over the last 15 years. Too fast, too impatient and too superficial. Fortunately, Bitcoin can fend off these "improvements".