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It's of course a click-bait title, while some of the classical aspects of light refraction can't be applied here it is for sure within the normal treatment of light physics (as is even stated in the article). Still, cool engineering and light hacking!

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'Spacetime wave packets' sounded to me like gravitational wave packets. Highly misleading term in this context, but probably also intended to attract attention.

I think that’s just the technical term. It fits the dichotomy.

Agreed. Still, it mislead me into thinking it was something else and had I known what this was really about I probably wouldn’t have clicked. While it is hard to tell that this technical term was deliberately coined to be click bait, there are certainly other ways to name it which wouldn’t be as misleading.

I think that really depends on what you are used to reading and is in neither intentionally or unintentionally misleading. There is quite a bit of literature about spatio-temporal correllations, spacetime correlations... outside the gravitational fields. It simply means that space and time are coupled.

I would understand spatio-temporal correlations different from spacetime correlations: the first are the spacio-temporal correlations of something which exists in space time while the latter would imply some kind of correlations of space time.

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