The suffixing patterns are flexible, because their most important job is marking the morphological family that the word belongs to.
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The brute memorization of a list of spellings that require an < -es > variant is both inelegant (no need to duplicate <z> and <zz>, for example) and incomplete.
Just some more evidence that the Facebook groups and their understanding is really neither here nor there.
This particular mistaken teacher is not the first person to be mistaken about these words, but here she is, passing her mistake along unchecked to her kiddos.
Remember kids, you cannot understand the system from looking at single words. You must look at words in their families in order to understand the system, every single time. Always. Without fail.