Tibet has been conquered easily, so we recognize a lacking of every magic defence from the side of a presumed supreme centre. Evola explains this as a fracture from every occult power or influence, according to the present situation: the end of a cycle. The only other explanation I can assume is that a defence on a subtle level could be hard to perceive, and the consequences visible only in time.
Moreover, there are people considering the hypothesis of an underground supreme centre in Asia, ruled by a dubious King of the World, as Guénon made, not so reassuring.
Fulvio