Serious mistake by the author, would have been caught already in this thread if the author's political agenda didn't match most of FRs :-)
.22 ammo and .223 ammo are very much different.
That wasn't the only one.
Chinese SKS 7.62 assault rifle,
SKS is not an assault rifle, nor even an assault weapon. Aside the bayonet lug, it's a very plain vanilla looking semi-auto carbine fireing an intermediate power catridge, about the ballistic equal of the venerable 30-30 lever action deer rifle catridge (yeh I know their are bolt action 30-30s too, probably break action and maybe falling block too for all I know, but it's most commonly associated with "cowboy style" lever actions)
The SKS, in it's original and most often seen form, doesn't even have removable magazine, one of the requirements to be an "assault weapon". It has a wood one piece stock, just like mnay hunting rifles of old.(aside from the gas tube cover that is) althoguh it can of course be equiped with a more modern plastic or composite stock.
Sorry - The mistake is yours.
There are many conventions shooters use when referring to weapons, chamberings, and specific cartridge terminology.
All Ammunition for .22 rifles is .22 ammunition. If you refer to a particular weapon, or chambering, then the terminology must be exact, such as ".22/250" or .25/.308 Ackley Improved.
".22 ammunition " is not synonomous with ".22 long rifle", which is a a specific, standardized cartridge chambered in rifles, pistols, combination guns, and many machine guns.