I feared this when you posted your first thread. It has happened to me once too, a barber telling me that a razor was shave-ready while it would barely cut arm hair! Perhaps this is pure economics: add a certain keyword to your product to sell more. And you're right, we tell all beginners to look for a hand-honed razor. It's just that some people cannot be trusted on their word, which is a damn shame.
I certainly encourage you to buy the red paste, it's quite an improvement over the green, whereas the black gives a minor improvement over the red. You will need an extra piece of leather to apply it to, if your paddle strop is also used for daily stropping (for which you need clean leather).