By that logic, yes, "printed copy" is superfluous text on Turnabout.
If something looks for the printed damage of a Turnabout, it will always see 0. ditto for any other printed values.
However, the "printed copy" more relevant than you think - consider Turnabout vs. Multiple copies or other Turnabouts, etc. Turnabouting any of those will net you a 0m0 attack, etc. on other values. Yeah, you'll always copy the base values on a normal attack because of the bonuses wearing off when it resolves, but it still works for copying attacks that aren't printed to begin with...