Imo the visual aspect of hookbaits is massively overlooked. Carp can see more than 4 times as many colours as humans, and can see in the UV and infrared spectrums - so basically their detection of colour is miles better than ours and they can see at night (explains how the black foam zigs work at night eh, lads). One thing I've taken from every underwater vid I've ever seen (going right back to the first Korda one in the late 90's) is that they see the hookbaits clear as day and are often drawn towards something a little different.... something that sticks out.
I used to spend hours/days/weeks/months preparing and glugging special hookbaits. Over the years I've stopped doing it as I now believe colour or visual appearance is way more important than food content or flavour (when used over bait anyway). I even have a stash of Proper Job Pop Ups with zero flavour that I prefer to fish over certain groundbaits.
Worth also mentioning that given their UV/IR vision, we're probably wasting our time trying to camouflage our end tackle. What's green or brown to us might look bright purple to them! You can see this on the underwater films too - sometime they just know something's not right. Luckily, they're not smart enough to know what a hook, lead, or leader is, so we catch in spite of it!
Anyway I digress....... shot on the hook rig? Been around for years as mentioned. I personally haven't fished a spot clean enough for that rig in years so I have no interest. Also have to agree with @kevtaylor that there's nothing in the newer vid to suggest it's the shot making the difference rather than the very short hooklink!