Well unless everyone lives next to the train station of course walking is involved. Perfectly valid that it also involves a walk.
Given that the journey involved 19 minutes of walking vs 15 minutes of actually being on a train, I would submit that it's hardly the train being tested. Equally the time for the train route is miscalculated as all of the participants leave Stanhope Avenue at 8am, which means that the train traveller has 15 minutes of standing around before the train arrives. The train passenger therefore would have taken 34 minutes if they had set off at a time consistent with the train timetable and had a season ticket.
So train and walking is 9 minutes slower than the bike. The cyclist only wins in terms of the commute if they cycle in their work clothes. The man pictured in the article is not in work clothes. He will therefore need time to lock the bike, walk to a changing room and put on his office clothes. I therefore call a draw for bike / train in terms of journey time in the context of this test. Car and Bus are clearly the losers.
Unless of course the office supports flexible working. Simply by starting work earlier or later than the morning rush, the car could actually be fastest provided that there is a designated parking spot. 8am is the worst time to depart on that route for a car. 7.30am is probably the latest that you would want to set off, or you would want to delay until 9.30 for a 10:00am start.
This is a good example of how a test can be set up to provide the result you want, rather than to test the optimum journey time for each mode of transport for the task required.