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My understanding is that there are reports of non taurine DCM in cats eating suspect diets who have had longer survival times if diet after diet change. So it appears that there could be an association. Case numbers appear to be fairly rare compared to cases in dogs. Here is a survey you might find interesting.

Personally, I think that since apparently there are no dietary DCM cases reported in dogs on the therapeutic diets with suspect ingredients and so few reports overall in cats I would think the risk very very low but not zero.

For cats who do not have a medical for need a diet high in suspect ingredients I would avoid them.

For cats who need a diet high in a suspect ingredient due to another medical condition I think it is an issue best discussed with your veterinarian.