I suspect what the author takes joy from is more the satisfaction of learning a new skill.

Like many things, bike maintenance eventually becomes a chore. Most of my (many) bikes over the last 30 years have been built from the ground up, including the wheels. And I don’t (or won’t) trust any shop mechanic to touch them. But now, the thought of doing any sort of maintenance fills me with dread - I want to ride my bikes, not spend hours fiddling with brake hydraulics and suspension seals!