AK74 is 22 cal, the 5.45x39 round it uses is similar performing to our 22 cal 5.56 round used in AR15 and similar popular sporting/defense rifles
While technically in the .22 caliber center fire rifle family, the .223 Remington (5.56mm) is almost never refered to as a “.22”. That is reserved for the rimfire family of rounds (.22LR and .22 mag).
The Russian 5.45mm round is just called that, and makes up a miniscule proportion of AK’s in this country. Mostly because the ammo is limited to surplus.
I agree with the basic premise of this story, I just think they should keep their facts straight. It’d be like me calling the 1911 a 9mm handgun. Possible, but not typical.