That is how I tie parachutes off now. Funny, I started tying back in the early 70's. There were no videos, youtube, even books with much on fly tying except the old school patterns and styles. So, I sort of learned on my own and tied parachutes the way I figured out on my own. The natural way seemed to be to tie the hackling feather off at the eye.
Now, I like the method of tying off at the post. Keeps things "cleaner".