Cruz did really well on Saturday, I doubt that he considers his campaign to be over. He probably feels that his chance to win in MS is over. Which, if true, gives him a good reason to take a day and rest. I can't blame him.
FWIW, I was speaking specifically about the rumor at the link. It hasn’t gained any traction today, so I’m assuming it’s not true. Because it’s a rumor, I’ll let you try that link yourself. I won’t type out the words in an unsubstantiated story online.