That’s fair. Re-reading the citation: tofu and soy milk contains very low amount of fibers so it’s probably not a greet exemple to illustrate "soy protein" if the fibers are at play. Or they aren’t. A dive into the source seems reasonable.

Note that saturated fat is also present in plants based food like peanut butter, although that one also contains tons of fibers (absent in animal sources). Coconut oil on the other hand is a tasty evil.