No you read it correctly but as I said, Visio's VBA doesn't make a great deal of sense. When I recorded it saved the theme as
.SetTheme 35, 35, 35, 35, 35
which is plainly stupid but most of those variables are optional so I removed them to make it simpler

In VBA, the brackets are optional unless you are trying to set a variable at the same time eg
Set aDoc = Documents.Add(sPath)
vs
Documents.Add sPath

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Andrew Lockton
Chrysalis Design, Melbourne Australia