Some interior camera footage with journalist observers here: https://vimeo.com/1093079343/22efd7a62d
This isn't cause for concern unless someone unaffiliated with Dan O'Dowd manages to reproduce it.
Honestly, I don't know if I could have stopped in time for some of those. I applaud the people for testing this though. I wish they had a way to test different length of time between when the dummy slides out and when impact would happen if no braking occurred.
Full interior camera footage with journalist observers here: https://vimeo.com/1093113127/e1fb6c359c