[Physicist]

And another thing: the bare statement "faster than light travel is equivalent to time travel" does not presuppose time travel into the past as you appear to be doing! Time travel into the future raises no causality issues of its own accord.

Nor would it constitute a "striking feature" of special relativity.

Please, please, please read the page you linked.

[AntiGuv]

Please, please, please read the page you linked.

Are you telling me to reread this part:

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By itself, this single use of the ansible doesn't create a causality violation. If Bob transmits a signal back towards Alice using a conventional light-speed transmitter, she receives it a later time than when she signalled to Bob. Even if Bob re-transmits with his ansible, Alice receives the reply just a little after she sent out her signal. The problems arise when we bring another inertial frame into play.

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Either tell me what I'm misreading or tell me why it's wrong!