Sorry, no. It's not his definition of perspective, it's THE definition of perspective.
How would this definition not apply, this is from a simple google search of perspective (it appears at the top);
"The art of drawing solid objects on a two-dimensional surface so as to give the right impression of their height, width, depth, and...
A picture drawn in such a way, esp. one appearing to enlarge or extend the actual space, or to give the effect of distance."
Granted we are not drawing in the literal sense of the word, but we are creating the image. Is our work "art" or are we just capturing an image relative to the viewer.
Personally if we are using the perspective as it relates to the content of the picture itself, I prefer this definition as it adds the element of depth.
This one is from the Free Farlex Dictionary online;
"4. The technique of representing three-dimensional objects and depth relationships on a two-dimensional surface."