That's an interesting question. Based on Grok's analysis, the answer isn't that tofu is UPF, but that your particular proposed method of creating a protein powder would not be UPF. Unless you followed that process with "additional steps like centrifugation, pH adjustment, spray-drying, and stabilizers", as would typically be involved in production of commercial powders, it would remain in Nova group 3 like tofu. (Whether it would be a particularly palatable or mixable protein powder is obviously another matter entirely.)

Of course I agree with the rest of your point, which is similar to what I was saying. (I also chuckled at your choice of analogy, as a founder of an encryption startup.) I have a lot of thoughts on the incentive structure[1], which I would dramatically overhaul given the option.

1: https://news.ycombinator.com/item?id=44808168