Transhumanism applies to basic everyday things like glasses, crutches, chairs, cars, etc. Some have even suggested (with basis) that sharable ideas can be a form of transhumanism.
I'm curious what the authors' true position is. They talk about the ideal being a "natural state". How "natural" are we talking about? No medicine? No farm equipment? No language? Just a bunch of primates grunting at each other ineffectively?
Maybe I should be more critical of how technology is evolving our species, but attacking transhumanism as an idea is reminiscent of the luddites.