Good video. Describes canonical application of Lorentz transformation very well.The tie-in to speed of light = speed of causality is logical for other reasons, such as: If we observe utilizing photons, then the speed of photons is the smallest granular unit for maximum velocity.But, in quantum physics, it only has to average out to that smallest maximum unit of velocity. Quantum physicists regularly borrow from time (using anti-time), much as how we can borrow from the complex plane when dealing with whatever regular numbers are called again.
So don’t be too shocked when you hear of things that violate the speed of causality as strange things do happen when you get to the edges of mass or velocity or causality, or interactions, or very low or high temperatures, or very tiny sizes.
In the world of the physically tiny, things get really ‘sticky’. [see coulumb] As it’s rare to work on an “atom in a box”, stuff like the Coulumb quickly assert and can make nano engineering difficult.