"long adverb" VS "adverb with 2 or more syllables"

Bonjour Stevenson, There is a «grammar rule» that says for adjectives that are longer words, they can be placed before the word without changing the sense of the adjective; however, I don't find a lesson that addresses this issue. I also have not heard it defined about having 2 or more syllables, but that quantification certainly fits. There is; however, a mention about other adjectives that precede the noun: Position of French Adjectives - More adjectives that go BEFORE nouns Bonne chance.