I plugged my Bamboo Connect into my Surface RT and it was detected properly. There is a matching icon in the hardware device list, and it works as a mouse. If hover over the Bamboo with the pen, the cursor will move. If you draw, tap, etc. it will respond as expected. The buttons even work. The most significant problems are that the Bamboo Connect does not calibrate to the Surface RT's screen edges. You have to reposition/recenter the pen manually (and frequently). Also, I don't think you can customize or disable the buttons.
But to say it's "Not Compatible" is incorrect. You can draw and write with it on your Surface RT.