> t's considered an Ultra-Processed Food of course, despite being a staple in East Asian countries that have much lower incidence of obesity than many Western countries.

"Ultra-Processed" and "causes obesity" are two massively different claims. If the claim is that said tofu is ultra-processed, obesity rates in countries where it is eaten are completely unrelated and do not work as argument.

Also, it is perfectly fine to define "non processed" group in a way that wont put every single meat into it. If you say that everything that requires killing or cleaning is ultra processed, then the whole term is meaningless.