The part i dont understand is as far as i understand, CRDT requires data types with commutative update functions, but SQL does not have that. The part i dont understand is how these two technologies that seem to have conflicting requirements are being joined.

Columns are LWW (last writer wins) registers within rows which are LWW maps. When concurrent writes occur because peers may not be communicating, there is typically an arbitrary but convergent selection based on peer id.