This node, I cannot find it in my blueprint even if I uncheck the Context Sensitivity checkbox.
I found the answer by myself: Animation Blueprint Library, including this API, is only callable in the Animation Modifier blueprint.
To access the play rate scale of an animation asset, you can first store that value in an animation curve and then read it from the curve value, with the target being the Anim Instance. I wrote an animation modifier to automize the data extraction, reading the rate scale and adding a curve storing its value. I think this solved all my problems.
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