I presume they would say that your muscles can tell whether the exercise is low-intensity or high-intensity. However, the quote that you are replying to is specifically comparing high-intensity leg press to high-intensity stationary bike, i.e., two forms of high-intensity exercise which involve comparable amounts of work. I don't recall that they specifically addressed that comparison. My overall sense of it, based on all I've read (including online discussions), is that high-intensity is good either way - either stationary bike or resistance.