I think that there is a misleading wording in the TOGAF document. Per the document, "Enterprise Continuum" could mean two things with different scope:
- The whole continuum which is partitioned into three distinct Continua:
The simplest way of thinking of the Enterprise Continuum is as a view of the repository of all the architecture assets. It can contain Architecture Descriptions, models, building blocks, patterns, architecture viewpoints, and other artifacts...
- One of the three Continua in #1:
The Enterprise Continuum
classifies contextual assets used to develop architectures, such as policies, standards,
strategic initiatives, organizational structures, and enterprise-level capabilities.
First one is most people's understanding which classifies all the architecture assets in the Architecture Repository, and second one is the "not directly used" in your question.
In this case it's kind of confusing that Enterprise Continuum (#1) contains Enterprise Continuum (#2) (and also the other two of the three Continua).