Irony in a Train Station Scene

In the following excerpt, the author describes a scene at a bustling train station:

"Amidst the chaos of travelers rushing to catch their trains, an elderly gentleman sat calmly on a bench, seemingly lost in thought. The world around him was a blur of hurried footsteps and distant announcements, yet he appeared completely unfazed by the madness. As a train approached, its whistle echoing through the station, several people dashed to the platform, but the old man simply smiled, savoring the stillness of the moment. Ironically, while everyone else was in a frenzy, it was he who seemed the most prepared, having already arrived at what they were racing toward."

The passage presents an instance of irony. What is the primary form of irony depicted in this scene?