My blog is 'just a blog' - they don't serve as the docs, or as QA test plan.
That being said, that slidedeck doesn't indicate support for ANSI join syntax support. We have that in the data modeler for defining views, but to best of my ability, it's not been avail in the worksheet as you are indicating.
I am sorry, but I do not understand what you are trying to say.
The only thing I would appreciate is a "Preference" that indicates if such a join is created either with "=" signs or with the keywords "join ... on".
Maybe you can add it to your internal feature/idea list for the tool.
I thought you were saying it was 'missing' or a bug. Yeah, that would be an enhancement request. Not planned for 4.1