"Type II fluids are "pseudoplastic", which means they contain a polymeric thickening agent to prevent their immediate flow off aircraft surfaces. Typically the fluid film will remain in place until the aircraft attains 100 knots or so (almost 200 km/h), at which point the viscosity breaks down due to shear stress. The high speeds required for viscosity breakdown means that this type of fluid is useful only for larger aircraft. The use of type II fluids is diminishing in favour of type IV. Type II fluids are generally light yellow in color."
source:
wikipedia
The AA 737 in your video has almost certainly been de-iced before departure. Modern de-icing fluid is designed to shear off before a certain speed and will take some snow laying on top of it with it when shearing off. This AA crew were most probably well within the published holdover time for the type of weather and fluid they were dealing with!
I think you have a lot to learn about de-icing.