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It means that they transcended the "works on my machine" stage, and can reliably run a quantum algorithm on more than one different quantum computer.

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They haven’t, though?

At least they claim that: «Quantum verifiability means the result can be repeated on our quantum computer — or any other of the same caliber — to get the same answer, confirming the result. This repeatable, beyond-classical computation is the basis for scalable verification.» (emph. mine)

But apparently they haven't demonstrated the actual portability between two different quantum computers.

What’s the difference between the claim that they’re making and what you say they haven’t done?

Saying something and doing something are different. They claim it is true, but they haven't demonstrated it by doing it.

If a company says they've built the fastest car in the world, a reasonable response is "ok, let's see it drive faster than any other car can", even though they already said that it can do that.

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