Americans and British like to believe they thought of everything first, boxing is one of those things. The truth is that during the British occupation of China, western hand to hand combat learned a lot from the Chinese. Similarities should be of no surprise
I didn't want to say anything because did not want to offend, but you put it so succinct it made me smile.
Shaolin have a very similar philly shell appearance incorporated into its forms or techniques.
Remember philly shell is a form of covering up or defensively retracting, its also scene in monkey style, its not as obvious as it is in boxing of course because in boxing you benefit from the gloves and ring ropes.
In Kung Fu arts its a sleight of hand type application to redirect a fast attack, or a pull back and attack simultaneously approach.
What we see on Youtubes and demos is usually at a full beat instead of at half a beat in full speed and power performing many moves in one instance or combined movements into one quick action.
This is where Youtubes demos, fail to show actuality, as you don't see the full picture of intent and experience.
Boxing is Boxing and is limited or limits what you can and cannot do, I love Boxing don't get me wrong its awesome but martial arts is broad in variety and techniques applied.
Jacky is pointing out a Kung Fu parry with a grabbing technique in snake form I believe covering arms and hand strikes, that in actual fact would momentarily hurt as your mind focuses on the intense grab/pinch while being hit and taken down.
But here they come you know what I mean, I'm running and hiding LoL
Just note with many TMA's its all taught in FORMS and KATA's where they applications differ in appearance or become more visible in actual combat due to the striking and intent of causing pain and injury. I hope I have somewhat added and put clarity to the thread.
All I know Jacky in his younger days was awesome, very talented and a knowledgeable man in the Martial Arts!