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That's interesting and yes, I guess it does just make sense cats have a nutritional requirement rather than an ingredient requirement. Just like everything else. However that is a questionnaire-based study.
A well-designed plant-based diet with added nutrients, that is complete to meet all the nutritional requirements of cats, has the potential to allow them to maintain health. However, a wealth of animal nutrition expertise is required to formulate and deliver such products.
This stood out for me though but I suppose if the people designing the cat food have the expertise required and they can be trusted then maybe it would be fine.
I'm not sure that I would go with the advice of a vegan youtube bro over veterinary advice to not feed cats vegan diets.
I understand why people might want to but I don't think that you can put your own beliefs above the wellbeing of the animal you are caring for. Please don't feed your cats vegan diets.