Good points Lee.

Which brings us back to my original question. Why this phrase in this temple? Certainly tombs might be a little more open to playful hieroglyphics than Seti's 'mansion' in Abydos.
Does the fact (IIRC) that the phrase "I give it to thee to rule the Two Lands like a well-doing son like unto thee" is written in cryptographic hieroglyphs indicate anything about the ideas expressed in the phrase, the exceptional nature of the ideas, or even the magical powers of the two Urai?