Maybe I'm wrong, but the terminology isnt that clear. Path tracing is a sub field of Ray tracing - Ray tracing refers to the camera into scene Ray generation. What he describes as raytracing sounds like the whitted recursive algorithm.
A notable example of that usage:
> When somebody says "ray tracing" it could mean many things. What I am going to describe is technically a path tracer ~ "Ray Tracing in a Weekend" by Peter Shirley
Ray tracing = ray casting from the camera and where an object intersects trace rays (with ray casting) to light sources and reflective materials (Turner Whitted).
Path tracing = ray tracing but when you hit an object start ray casting from that point as bounce and gather all energy so you can send it back to the camera (James Kajiya ?).
So to me path tracing is just a method (extension) of ray tracing.
The terminology just isn't 100% consistent.