Benevo Cat foods contain all the nutrients an adult cat needs, including a wide range of vitamins (including A, B, D, E, K), essential fatty acids and taurine, without the need for slaughterhouse meat.
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Benevo Cat is a professional cat food, created by Benevo in 2005, formulated and checked by independent animal nutritionists to meet the AAFCO(USA) and FEDIAF(Europe) guidelines for animal nutrition.
You’ve prevented no evidence to support the claim that protein enrichment in cat food will hurt your cat.
https://www.aspca.org/news/why-cant-my-cat-be-vegan
Also there are people with horror stories as well
https://www.benevo.com/vegan-cat-food-from-benevo/
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shrug
Looks like they solved this problem 20 years ago.