This is just a note to register shuto-uke (knife-hand block) as yet another technique that changed dramatically during the period when the Shotokan katas were being tuned up as performance art. The old knife-hand block swung both hands in the same direction at the same time, using old-style hip rotation as a power source. It often appeared as a lower-level block, too, for instance at the end of pinan nidan (heian shodan). The new version is a mid-level block with the hands going in opposite directions, in a "brush-pass" type deflection, entrapment, and counterstrike.
The "brush-pass" technique is an honored self-defense technique. I have no objection to it as a practical tool, but it is very different from the technique in the original katas. This is another shotoism.