Voynichese Phonotactics

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I don't see why this should be true.  The Wikipedia page on syllabic consonants provides counterexamples in English: A syllabic consonant or vocalic consonant is a consonant which either forms a syllable on its own, like the m, n and l in the English words rhythm, button and bottle...  In both "rhythm" and "button" you have a syllabic nasal following a consonant.

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I don't understand why Wikipedia would use button as an example, alongside rhythm and bottle. Rhythm is a good example, but "button" has the vowel in front of it. The consonant "n" isn't syllabic on its own.