Communication is a behavior and act, not a personality type. The suggestion here is that it's ok for someone who doesn't communicate well to be accommodated in the name of diversity. The notion of "poor communicator" as a personality type doesn't jive with me.
Replace "communication" with "data modeling" or "project management" or "reading". There are plenty who don't necessarily possess those skills.
Should we expect that others shouldn't develop skills in those areas (assuming they are important for their role) in the name of "diversity"?