Operational Transformation and Conflict-Free Replicated Datatypes are very different from each other.
As the author explains, OT relies on some ordering of system events, and CRDTs don't. That means CRDTs need to be commutative (and probably associative), and OT doesn't.
So, OT is less scalable but more powerful, and CRDTs are more scalable but less powerful (in theory).
It's sort of like comparing Paxos/Raft to Bittorrent.
As the author explains, OT relies on some ordering of system events, and CRDTs don't. That means CRDTs need to be commutative (and probably associative), and OT doesn't.
So, OT is less scalable but more powerful, and CRDTs are more scalable but less powerful (in theory).
It's sort of like comparing Paxos/Raft to Bittorrent.
(I am not an expert on OT.)