There is limited research on the impact of the vegan diet on the feline companions in comparison to canines. As it is not as well known in the general public that cats can be healthy on a plant-based diet provided with taurine, B12, vitamin A.
Vegan diet:
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https://www.magonlinelibrary.com/doi/abs/10.12968/vetn.2022.13.6.252
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https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0253292
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https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0284132
Vegetarian diet:
Good rebuttal. Had not considered the panda case. Still, the inconvenient fact remains that the human lineage for, say, the last 10 million years is mostly vegetarian whereas that of domestic cats is entirely carnivorous.