I don't think the note near the graphic scale is necessary. That is your reference no matter what scale it was printed at.
I've seen several versions of this:
That message is often meaningless, as the SHEET size MAY be exactly as noted, yet the image on that sheet might still be wrong and thus NOT TO SCALE.
I have also seen versions that want people to measure the area of the border; leading to possible errors as well, because now you are asking someone to
successfully measure greater than a typical single scale length without inducing errors.