Time Control Technologies and Methods
(media.scored.co)
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Yo what's this from?
https://www.andersoninstitute.com/time-control-technologies.html
As a time traveler, aside from Tipler cylinders not being that tech-viable, I fully affirm this as an excellent overview of the state of the art prior to the 2025-27 revolution.
There is one technology that is not currently counted as time travel even though it has the same five characteristics as Alcubierre. It's called "Sleep" and is very effective for future time travel in the 1-12-hour range.
While this is clearly just a coatrack to give this place bad optics, changing the past like that would also make it so they would have never been born.