The guy, Christian, is a regular poster on another board I frequent.
One of the things he clarified there is that he rarely rides both ways each day. He'll bike in, take the train home, train in, bike home, and so on.
Thanks for the info. This makes more sense for the average human being with other things to do besides live on a bike, work, and sleep. I was stuck with a 30 mile (round trip) commute for about 18 months when in my late 40s. My reasonable limit is 150 miles in a day, but not day after day as a commute. Even the 1 hour each way commute, though no big feat of physical prowess, took more time that I really wanted to commit to cycling every day. I had no other options, so I lived with it. Had there been a train, I likely would have been really happy cycling into work, then napping on a train in the PM.