It appears to be in lieu of halo traction. It appears to be ambulatory traction. They do an anterior release (remove discs) just like they do ahead of halo traction.
After this procedure and halo traction is a definitive fusion. That is what is referred to as internal fixation in my opinion.
Now it is up to the individual if they want to be in halo traction or have this ambulatory traction prior to fusion. That is for each person to decide.