Multiple sclerosis and sugar-sweetened beverages: "and the results do not show that soda and sugar-sweetened beverages cause more severe disability"

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May someone explain to me this headline?:

SODA, SUGAR-SWEETENED BEVERAGES LINKED TO MORE SEVERE SYMPTOMS FOR PEOPLE WITH MS. American Academy of Neurology, Mar 05 2019.

https://www.aan.com/PressRoom/Home/PressRelease/2701.

Inside, it says:

While these results need to be confirmed by larger studies that follow people over a long period of time, and the results do not show that soda and sugar-sweetened beverages cause more severe disability, we do know that sodas have no nutritional value and people with MS may want to consider reducing or eliminating them from their diet,” Meier-Gerdingh said.

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