The Scientific Method
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The 30 minute travel time claim is completely technologically illiterate, but you don't need to use beamed power for every step of a journey to make it useful. Not needing to use any fuel to ascend out of the Sun's gravity well still saves you a lot of mass.
I'm being slightly hyperbolic on the never slow down. If you want to use a solar sail to go near the speed of light (the claim of the article) you need just as much energy to slow down somehow. And you have to carry that energy on your ship.
You might be able to slow down on a gravity well but I'm getting out of my practical knowledge and into my scifi knowledge now.