There is surface coating on most leathers, not just heat applied or "paint". What exactly do you think the color pigment is mixed in with in the outer coating? "Plastics" include are a wide range of synthetic
or semi-synthetic materials that use polymers
as a main ingredient, and this certainly is a part of the coating that is applied to leather, and not just epi leather. Epi leather has a heavily corrected finish which includes a thicker coating than many other leathers. I chose to use an umbrella term "plastic", as I'm not sure exactly what goes into the mix that Vuitton uses but you can be sure that the material falls within the definition of "plastics". The feel of the epi leather should make this obvious. There are pros and cons to having such a heavily corrected leather surface.
He certainly has an agenda that is very clear, but my main point was basically to show the thick layers on top and there aren't that many other videos doing that in a good way that I can find. Please feel free to add other examples that may be helpful if you come across any.