Vocabulary in a science book (To switch or not to switch… )

I posed this question on the Braille Formats section, but on second thoughts, it may be more appropriate here. I apologise for the mix up.
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Braille Formats 2016 shows how to transcribe items such as

amaze + ment = amazement
hope + ful = hopeful

under Section 17 where UEB mathematical signs are used.
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Question:

In a UEB with Nemeth transcription, where a science book has a grammar sections where they use math symbols in a literary context. Would you still switch to Nemeth for this item?

This is what the text looks like:

       Vocabulary Skill

Greek Word Origins             Many science words come to English from Greek. In this chapter, you will learn the term geocentric. Geocentric comes from the Greek word parts ge, meaning "Earth" and kentron meaning "center."

Earth + center = having Earth at the center

Learn these Greek word parts to help you remember the vocabulary terms.

The displayed text is clearly not a mathematical expression, so should it be transcribed using the UEB + and = signs?
The preference for consistency of braille symbols is understood, but would this situation be an exception to that guideline?