I would not say that the statement itself is accurate. I haven't felt it was accurate from the time it was written given the other things going on. Not a lie, but one people read the way they wanted to read it instead of what Canvas was saying. We have no schedule to remove it wasn't mean that there aren't plans to keep it around. Canvas has deprecated it and they will not keep crud in the code just to support something that has been deprecated. People should try to move away from relying on the deprecated style guide and definitely not start any new projects using it.
I agree that the new RCE is independent of the style guide and so changes to the RCE should not affect the way it is rendered once it's out of the RCE. Things in the style guide may not render properly within the RCE.
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