When you stay on DVC points and purchase the dining plan, you are NOT required to buy tickets. As a lot of DVC members are annual passholders, this makes sense.
This new "cash" package Disney has offered means you pay rack rate for your room, you purchase tickets for EVERYONE in your party, and then you get the free dining plan. Disney probably offered it because it's hurricane season and most kids are back in school. I think they offered this same deal last year if I remember correctly.
I would break it down and do the math. See which one is the better deal for your particular situation. Whether you need tickets or not would be a big deciding factor for me. Plus, the rack rate on a deluxe resort is not cheap.