This. They need to say this. If for no other reason than to scare away potential bidders.
The Jazz gave hayward every chance to be a superstar and he doesn't have it. At best he's the third best player on a championship squad. You don't pay those players 13+ million. I've always thought 11 million a year for four years was fair. 12 is pushing it, but I could see the Jazz matching an offer of 12 million.
Jazz say this whether or not they intend to actually match. They hope it scares off other teams so they can sign Hayward to a less than max deal. Might be true, might just be a bluff.
Why is that a better strategy than saying they DON'T intend to match offers? That way they'd presumably get low offers, which they could then match. This way if they do get offers, they will be very high offers. (That's of course assuming other teams use these types of things when making their offers, which I'm quite sure they don't.)