I don’t read it that way at all. Several people jumped to a conclusion based on a tweet but the policy has always been that you could only take the mask off while actively eating, that hasn’t changed. Under the dining policy it now states:
when dining at a restaurant, guests must wear face coverings while standing, waiting, or sitting in dining locations.
Nowhere does it mention that you must replace your mask between bites of food or sips of a drink. If you have a plate of food in front of you and you are eating from it you are actively eating, even between bites. What this clarifies is if you are seated at a table but not actively eating you must put your mask back on. So if you stop in Cosmic Rays to get out of the sun or to wait out an afternoon thunderstorm you must stay masked while standing indoors or sitting at a table. In other words every dining location isn’t an automatic relaxation zone where masks can come off for a “mask break” as long as you are seated. The “replace your mask between bites” narrative is just a straw man created to make the mask rules seem overbearing or extreme. Nothing to see here, unless you were planning to use the restaurants as a relaxation zone, then you probably need to switch to the actual mask free areas setup instead.
Don't ask me how it’s safe or OK to sit with no mask in those relaxation areas but not ok in a restaurant. I think this is purely a money play. They want to clear out the tables at restaurants for paying customers. Since dining capacity is still limited and park capacity is increasing and will be increasing more over time they are going to run out of room for people eating meals. This clarification comes as we approach the Spring and Summer when temps start to rise and more people seek a place to cool off in the AC.