He bought a computer that wasn't old, probably discounted, and with more than enough power for a variety of uses. Obviously, people generally tend to buy the latest model, but by doing so, he has preserved the possibility of using Sequoia for years and, if it improves, eventually upgrading to macOS 26 or 27.
So far, I've heard of few people who have seriously expressed their intention to leave Apple... Many (myself included) hope that better days are ahead, but having Sequoia allows us to wait with more peace of mind... (in my case, I have two minis with M4 and Sequoia and 1 MBpro with 26.3 beta 1). I would be happy to be able to upgrade peacefully as I have done for the last 28 years of using a Mac... but this time, caution seems to be a must in order to have a reliable computer.