The Virginia Department of Education updated its definition of brain injury which should be updated in this document as well.
The CDC https://www.cdc.gov/traumaticbraininjury/get_the_facts.html describes an injury received during childhood is different and affects brain development.
Page 10: Exclusions: Brain damage secondary to other neurological insults (eg. infection of the brain, stroke, anoxia, brain tumor, Alzheimer's, and other conditions causing dementia and other diseases causing neurodegenerative diseases) is not considered a TBI. These are not TBI but they ARE brain injuries and should be considered.