Strange idea of product placement.
No, i think it's great but can't help of thinking that they staged what they wanted to see, if you look at the experimental setup ?
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We use an indirect 'stroboscopic' method that combines millions of repeated measurements by careful scanning in time and viewpoints"
If you think of light refraction, the frequency of light is indeed changed, so it moves slower in a way through e.g. glass. So there is "slower light". You can think of particle fronts instead of waves like p(ressure)-waves within other media like rock.