Let event "A" = 'all these things' ...
If event "A" did not happen in 70 AD (by demonstration) ... and event "A" has not happened as of 20 April 2010 (also by demonstration) ... and event "A" MUST happen eventually (since its predictive prophecy) ... then event "A" must be future ... aka. via Spock "Logical conclusion ... arrived at logically."
Its nothing like circular reasoning ... it's progressive logic ... deductive reasoning.
That's where the circularity comes in. The argument assumes the conclusion. The conclusion: the events didn't happen in 70 AD. The premise: the events didn't happen in 70 AD. The very definition of circular reasoning.
How would the argument be made legitimate? By demonstrating that the events didn't occur in 70 AD. Asserting, however, is not the same as demonstrating.