> If a learner is not oriented towards written or read communication, their exam results may not reflect a written test

Being unable to communicate what you have learned is a serious disorder and not a learning style issue. Learning styles are about how you learn, not how you demonstrate what you learned.

But yes, people who are unable to write or read or very bad at writing have problems and tend to get extra support on written exams to make it fair for them, as the exam should test their knowledge and not their ability to write. For example they don't give blind people a zero just because they failed to read the exam.