science

I'm not conflating anything. A concussion is literally considered a mild TBI.

A concussion is a mild traumatic brain injury that affects brain function. Effects are often short term and can include headaches and trouble with concentration, memory, balance, mood and sleep.

https://www.mayoclinic.org/diseases-conditions/concussion/symptoms-causes/syc-20355594

Concussion is a type of mild TBI that may be considered a temporary injury to the brain but could take minutes to several months to heal.

https://www.ninds.nih.gov/health-information/disorders/traumatic-brain-injury-tbi

The Centers for Disease Control and Prevention (CDC) defines concussion as a traumatic brain injury (TBI) caused by a bump, blow, or jolt to the head or by a hit to the body that causes the head and brain to move rapidly back and forth.

https://biausa.org/brain-injury/about-brain-injury/what-is-a-brain-injury/concussion-mtbi