An Enterprise Architecture Capability is the ability of the organization to perform effective and efficient architecture work, including the definition, governance, and management of its architectures2. The Preliminary Phase involves the following activities1:
*Reviewing the organizational context, scope, and drivers for conducting Enterprise Architecture
*Establishing the Architecture Capability desired by the organization, including the maturity level, roles, responsibilities, processes, and tools
*Defining and establishing the Organizational Model for Enterprise Architecture, which describes how the architecture function is organized and integrated within the enterprise
*Defining and establishing the Architecture Governance framework, which provides the mechanisms for ensuring the quality, consistency, and compliance of the architecture work
*Selecting and implementing the tools that support the Architecture Capability, such as repositories, modeling tools, and communication tools
*Defining the Architecture Principles that will guide and constrain the architecture work, based on the business principles, goals, and drivers of the organization
*Defining the Organization-Specific Architecture Framework, which is an adaptation of the generic TOGAF ADM to suit the specific requirements, standards, and practices of the organization The Preliminary Phase is essential for preparing the organization for the successful development and implementation of its architectures, as well as for ensuring the alignment of the architecture work with the business strategy and objectives1.
References: 1: Preliminary Phase 2: Enterprise Architecture Capability

Statements 1 and 3 about architecture partitioning are correct. Architecture partitioning is the technique of dividing an architecture into smaller and more manageable parts that can be developed, maintained, and governed independently. Partitions are used to simplify the management of the Enterprise Architecture and to enable different teams to work on different elements of the architecture at the same time. Partitions are not equivalent to architecture levels, which are different degrees of abstraction or detail in an architecture.
Partitions do not necessarily reflect the organization's structure, which may change over time or differ from the architecture's scope and boundaries. Reference: The TOGAF Standard | The Open Group Website, Section 2.5 Architecture Partitioning.

In the ADM documents which are under development and have not undergone any formal review and approval process are called "draft". This indicates that they are subject to change and refinement as the architecture development progresses. Reference: The TOGAF Standard | The Open Group Website, Section
4.2.5 Architecture Deliverables.

"The Content Metamodel defines a formal structure for these terms to ensure consistency within the architecture description..." A metamodel used across the enterprise enables consistency and completeness checking of the architecture description against the defined structure. Open Group Publications Reference: The Open Group, TOGAF 9 Conformance Requirements-Content Framework/Metamodel description.