Comment #1 on issue 750 by tudor.gi...@gmail.com: GLMTextModel(Object)>>doesNotUnderstand: #highlightSmalltalk: http://code.google.com/p/moose-technology/issues/detail?id=750
No, this is simply old code that did not get updated. You should change the code to use the SmalltalkCodePresentation instead of TextPresentation.
You can see an example here: http://www.themoosebook.org/book/internals/glamour/presentations/smalltalk-c...