They are hybrids
They are uniform (meaning that all of the seed you get will produce plants that are identical). They will not be segregating populations. All of the seed will be F1 hybrid seed.
No hybrid is "stable" -- these, like any other hybrids, will not produce uniform plants in subsequent generations, and the companies selling are not claiming they are "stable".
I see where the confusion comes from though. They are not clearly labeled as F1 hybrids (perhaps because they know some people will prefer to assume that they are not).
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