It does flat out say anyone who doesn't like it will be given an offer. I assume that refers to the offer you get when you first join where they pay you to quit. So the letter does flat out say, join the holocracy, no more management, if you don't like it, we have a retirement offer for you.
Sure, but explicitly saying "if you don't like it, have a retirement offer" seems a lot more pleasant than the implicit "if you don't like it, don't let the door hit you in the ass on the way out" that comes with basically any major corporate communication. Those are always your two choices when changes come down from on high. All this guy's doing is making option #2 explicit.