What could session.Notesbuildversion return but version number?

In standard 8.0.x and 8.5.x Mail template, the ($Calendar) view has this code in Initialize:Dim s As New notessession

If s.Notesbuildversion Then

…Execute(|

…Use “CSUIViewClass”

…set cvCalendarViewBroker = new CalendarViewBroker

…|)

End If

But according to Help, s.Notesbuildversion should return the build number - “If the script runs on a workstation, this property returns the workstation’s release number.”

The code is testing for a true/false condition, so as far as I can see, it will never execute. Am I not understanding something???