It is perfectly correct to call a CONOPS a description of architecture, in a situation where the term CONOPS is used to mean an operational solution description.
Architecture is a general term for the conceptual design of anything; CONOPS is a description of the concept of the operational (i.e. serving end-use) part of a solution involving both human and technological elements.
CONOPS (operational solution description) is not to be confused with Operational Concept Description (description of intended use). It often is 🙁