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You have two sealed envelopes, one carrying a red card and the other a black. You shuffle the envelopes randomly and give one to your friend who goes to Mars. Once there, your friend opens their envelope and immediately knows the color of the card in your envelope.

Is this faster than light communication?

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If I understood the article correctly, you could also change the property of one card and see the effect instantaneously in the other.

You can know the other by observing one, the entanglement is then broken. You cannot change the state remotely. We can't say that the entangled particles were X and Y to begin with because that requires measuring them, which breaks entanglement. Quantum is heavily misreported on, often times by scientific bodies for the purposes of funding.

is “the quantum internet” not grounded in reality then?

No, it is fine in the sense of https://en.m.wikipedia.org/wiki/Quantum_network#Applications. But it doesn’t allow FTL communication, in case you heard someone claim that.

I would say it’s logical deduction. Communication is when you send information, including something I can’t possibly know ahead of time.

No info was sent.

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