Present perfect and its interpretation

To my eye this is a resultative present perfect; but it is very easy to see why you might think it is a continuative present perfect:

• The verb here is ambiguous. Has been invested may be parsed as either the present perfect passive of the eventive verb INVEST or as the present perfect of the stative verb BE + the present participle of INVEST employed as an adjective.

• At first glance, the temporal expression which introduces the sentence looks like it's defining just such a duration as a continuative perfect requires:

  A half century past the beginning of the movement

  But in fact what this defines is not a duration but a location, a single point: now.

  The movement has now been invested with an aura of mystique.

The inferences you may draw are that:

The movement, at its beginning, did not have an aura of mystique.
At some later point it was invested with an aura of mystique.
As a result it now possesses an aura of mystique.

That's a classic resultative perfect:

(2)a. Resultative: There is one event of the type denoted by the base sentence in the interval terminating at the evaluation point, and its direct result holds at this point.
  b. Policeman (on road): Can I see your license please. Driver: I’ve left it at home.
  Anita Mittwoch, "The English Resultative perfect and its relationship to the Experiential perfect and the simple past tense", *Linguistics & Philosophy (2008) 31:324 .