The problem starts here:
Reading level: WCAG 2.0 criterion 3.1.5 LEVEL AAA
When text requires reading ability more advanced than the lower secondary education level after removal of proper names and titles, supplemental content, or a version that does not require reading ability more advanced than the lower secondary education level, is available. (Level AAA)
When text requires reading ability more advanced than the lower secondary education level after removal of proper names and titles, supplemental content, or a version that does not require reading ability more advanced than the lower secondary education level, is available. (Level AAA)
The phrase 
What do communications people do? And how does plain English differ from clear language, technical writing, information design, usability and business communication?