I didn't watch the full video... but in response to OP question: Is an SKS an Assault Rifle? According to WIKI... I thought this was interesting:
Definition
The term assault rifle is a non-direct translation of the German word Sturmgewehr (literally "storm rifle", "storm" as in "military assault"). The name was coined by Adolf Hitler[11] as a new name for the Maschinenpistole 43,[nb 1] subsequently known as the Sturmgewehr 44, the firearm generally considered the first assault rifle that served to popularize the concept and form the basis for today's modern assault rifles.
The translation assault rifle gradually became the common term for similar firearms sharing the same technical definition as the StG 44. In a strict definition, a firearm must have at least the following characteristics to be considered an assault rifle:[12][13][14]
It must be an individual weapon with provision to fire from the shoulder (i.e. a buttstock)
It must be capable of selective fire
It must have an intermediate-power cartridge: more power than a pistol but less than a standard rifle or battle rifle
Its ammunition must be supplied from a detachable box magazine
And it should at least have an effective range of 300 metres (330 yards)
Rifles that meet most of these criteria, but not all, are technically not assault rifles despite frequently being called such.
For example:
Select-fire M2 Carbines are not assault rifles; their effective range is only 200 meters.[15]
Select-fire rifles such as the FN FAL battle rifle are not assault rifles; they fire full-powered rifle cartridges.
Semi-automatic-only rifles like variants of the Colt AR-15 are not assault rifles; they do not have select-fire capabilities.
Semi-auto rifles with fixed magazines like the SKS are not assault rifles; they do not have detachable box magazines and are not capable of automatic fire.
The U.S. Army defines assault rifles as "short, compact, selective-fire weapons that fire a cartridge intermediate in power between submachine gun and rifle cartridges.
An Assault Rifle according to this must have select fire - which means more than just single shot. Must be able to burst and/or have full auto capability. Therefore, by this definition, no firearms in Canada can legally be an assault rifle.
Hope that answers your question OP!