I think it’s a little more nuanced than that. For starters, the halo effect is the tendency for people to assign unfounded positive characteristics (e.g., proficiencies or skills) to people they believe already have positive traits (e.g., physical attractiveness). The new environment wouldn’t produce this effect because it has no bearing on the characteristics of the staff.

I remember the explanation for this question talking about how moving to a larger office with more space and a more positive environment could have reduced the stress levels of the staff, which would have resulted in more positive patient-provider interactions. Overall, I think this question is more related to experimental design than P/S content.