I think you somewhat restated the thesis of the article.

I probably bike around 2.5km a day as well. I live in the Netherlands, and I don't even own a car. My bike gets me to most of my regular and daily destinations faster than a car would. Partially because I can take faster routes as a cyclists, and partially because in a car I would have to wait for traffic lights more often and be stuck in busy traffic during peak hours.

The only reason why I would use a car, is to get to family that lives further away. But even that stays within 50km. So the dutch public transport system fully satisfies that need for me as well.

Many people consider it a walking distance. If you go on foot both ways but sit 8h at work you can still find it dificult to hit 10k steps per day (WHO recomendation IIRC).

I'd consider it walking distance. Unless I was planning on carrying enough stuff to warrant the use of a bike trailer, I wouldn't bother getting my bike out for a trip that short.

Austin cyclist here. My daily commute is about 4-5 km in total. When I get groceries I'd probably travel about twice that distance in a day.