He never said they did, he was simply saying that the portrait slider concept from the site was not a blackberry clone and that he thought that the Torch was RIM's first portrait slider. If that portrait slider is a clone of anything, how about it be a clone of the Palm Pre, you know the previous WebOS device.
And who did invent/was first to really put out a portrait slider? In the same way that Microsoft/Apple didn't invent the GUI paradigm that we have now, but they are more widely attributed to its existence.