I cant speak for the manufacturer of that product but sequential ignition has 4 seperate coils that are mounted on top of each plug.
This removes any need for HT leads.
The coils are fired in the firing order of the engine and are smaller.
The advantages are less power consumption, less electrical noise, precise spark voltage and the plugs last twice as long as there are no wasted sparks.
Also, as the coils have on board ignition amplifiers, you dont seperate ones anymore .

Its a modern approach !