I think they're noting how the nature of baby duck syndrome might depend on whether the change introduced is within something that is for work or for play.

As in, that people who refuse change in their play activity are in some way different (less rational? more "syndromatic"?) than those who refuse change in their breadwinning activity.

I see the distinction, but am not sure I agree. It's just a neurotype spectrum of the same phenomenon. Baby duck is baby duck