In order to believe time travel is not possible, you’d have to carry the notion that it will never be possible. Not in 10 years or not in a million.
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Looking Glass is not about timetravel hut about alternate timelines.
It's about looking forward in time to alternate possible futures. If it is a real tech, it dictates the Many World's interpretation of QM is the correct one (probably), and also creates wormholes (multiply connected spacetime). So it's about both (as purported).