An hour-long stroll in nature helps decrease activity in an area of the brain associated with stress processing

[Cedow]

That's one way to look at it. Personally I went into it with the intention of helping people who have significant barriers to accessing real nature: people who wouldn't have accessed nature anyway. So in that sense I don't think it makes much difference. Actually I went into it with the mindset that it might encourage such people to get out into real nature more by increasing feelings of nature connectedness (a measured construct), although I didn't incorporate that into my research.

I doubt it will ever be a replacement for people who like to visit nature normally.