Mike Tyson knocked plenty of folks thru the ropes afaik.
<iframe width="560" height="315" src="//www.youtube.com/embed/TpHNmL9hs_I" frameborder="0" allowfullscreen></iframe>
I don't see a single incidence of "knocked thru the ropes". I see some falling into the ropes, like a tree being felled, because their brains have disconnected, but I don't see anyone being "sent flying"
Tecniques that send the object they hit flying, are pushing tecniques, not impact tecniques.
A good impact tecnique is absorbed by the object it hits, that is what causes internal damage.
A push tecnique, like the sidekick Lee demonstrates in your link, will only damage the object it hits, if that body happens to fall under a passing bus.
Looks real fine in movies, though.
Bruce Lee is a religious object, and that is why it is impossible to have a rational discussion about him.
It is like discussing religion with a born again christian.
Can't be done.