It's all there, black and white, clear as crystal! You moved your primaries beyond February 5! You bumped into our earlier states, so you get nothing! You lose! Good day, sir!
It's not that simple. If the DNC enforces the rules exactly as they are written, then IA, NH and SC would also lose their delegates since they also moved their voting dates.
DNC rules carves out exemptions for those states, and Iowa also has the "caucus loophole" in its defense (they didn't really select their national delegates then.) This is what got Iowa and Nevada off the hook on the GOP side.
I predict that in the end the state parties will keep refusing a revote, but the DNC will eventually offer to pay for it, and it'll happen.