So saying it’s ‘shaken baby syndrome’ just because there are internal injuries is junk science.
According to the Mayo Clinic you can:
"While sometimes there's bruising on the face, you may not see signs of physical injury to the child's outer body."
It doesn't get into the nuance, nor is intended as a validation for facile forensic based witch-hunting.
Many forms of trauma can cause these injuries (especially 'trio'), but alone and without matching external trauma, shaking becomes the most likely cause.
Which isn't to say that shaking couldn't also cause some external trauma.
Just the fact it’s on mayoclinic doesn’t mean all that much.