Article 5 free movement: Member States shall not impede the making available on the market in their territory of products + the provision of services that comply with this Directive (the free-movement clause that completes the internal-market logic of the EAA). Article 6 additional accessibility requirements: this Directive does not preclude Member States from maintaining or introducing higher levels of accessibility requirements for non-EAA-in-scope products and services in their territory, or for additional accessibility requirements on EAA-in-scope products and services where those higher requirements are necessary + proportionate. The interaction with Article 5 means that for in-scope products + services, EAA accessibility requirements are MAXIMUM HARMONISATION + free movement applies; for out-of-scope products + services, Member States may maintain stricter national requirements (no harmonisation hook).
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.