What an odd thing to say. People have died with far less. Bumping into the plates and causing her to list at the hardest portion of the lift (both for her and for the spotters to help) could easily result in serious injury or death.
She had almost 740 pounds on her back. Go to a gym. Load that much weight onto a bar. Try to roll it around on the floor a little.
Now suppose this sudden unexpected jolt from the interference causes a muscle tear. Again, it’s happened to people lifting far less. Assuming the saboteur decides to help, now every single member of the team of five spotters would suddenly need to catch 150lbs in their outstretched arms.
Yes, he absolutely did risk her life, to say nothing of the risk posed to her health and her career