That general procedure from 2010 hasn't changed. But I do suggest that you send an actual page of this glossary so I can the print that goes with your specific question.
And I have a question for you, since I don't know Nemeth. Suppose there was no Spanish here at all. In an English Nemeth transcription, how is parentheses handled in non-math text? Are OF and WITH contracted in non-math text or always uncontracted even in non-math text?