Tough call, I'd call pressing restoration in the most loose sense. No, the book wasn't soaked in methyl cellulose to clean it, had the staples replaced or trimmed. However, the bottom line is you've improved a books appearance and most certainly increased it's value. I don't see it as a downfall as I've owned pressed books. Sure, I'll flip a book over and search for ripples; the most telling way to see if a books been pressed or not? At the end of the day it's not comprehensive restoration and I don't believe CGC needs to notate it.