20.372 style:text-position - final sentence, fourth paragraph - what "additional calculations."?

Now reads: "The second value may be present and specifies the font height as a percentage of the current font-height. If this value is not specified, an appropriate font height is used. Although this value may change the font height that is displayed, it never changes the current font height that is used for additional calculations."

Final sentence:

Err, if present at all, this value changes the font height displayed, yes? Why else have it?

Moreover, what "additional calculations." ?

Suggest delete the entire sentence.