Hello NI,
it seems that there is a cut & paste error in the help for the ATTR_YREVERSE.
Right now it says:
Determines whether to reverse the orientation of the y-axis so that the lowest value is shown at the right. If the orientation of the y-axis is reversed, the horizontal orientation of the plots is also reversed.
In my opinion, there is no 'right' for an y axis, it probably should be 'bottom', and there is no horizontal orientation but a vertical.
You're given the chance to fix it