The link to the FIM homologation standard from OP is broken, here is the correct one to the list of FIM approved helmets: http://www.frhp.org/circuit-helmets/homologated-helmets
Note that the FIM homologation standard is for racing so a whole range of helmet types will never be approved by FIM. One should also keep an eye on ECE standards.
A better video regarding the broken Snell standard(s):