“What events in AD 70 happened to fulfill this?”
.
None!
Preterists like to insert allegory into a sentence that they insist had to also be literal.
There is no allegory in scripture that is not announced to be allegory in advance.
.
It's not allegory; allegory has a specific meaning. It is, however apocalyptic language - a form of literature that had certain defining characteristics, among which was the use of vivid "cosmic" imagery to be fulfilled in much more earthly forms.