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If I'm understanding that listing, it is a fixed color strip - that is, all LEDs are on a single channel; you could control it so that all LEDs are on, all are off, or all are at the same dimming level. You can choose among a few colors, and one of the colors is "RGB" but that means alternating those fixed colors along the strip, without individual control of each color (still only one channel, not three channels).
That's a viable option, so long as you are not expecting 3 channel RGB control for color mixing.