I suspect the reason is because Buddhism is lumped in with the other major world religions, and therefore considered a form of faith or belief. If the author knew Buddhism well then they would realise that couldn't be further from the truth.
Another possibility has occurred to me: they know Buddhism but don't want to scare away readers that have the above misconception. Actually I often find myself avoiding Buddhist terminology when I'm asked about my meditation practices.
Another possibility has occurred to me: they know Buddhism but don't want to scare away readers that have the above misconception. Actually I often find myself avoiding Buddhist terminology when I'm asked about my meditation practices.