Lanting's narration is not a typo. The preface and verbs in Wang Xizhi's Preface to Lanting Collection all have narrative meanings. The verb meaning of "Xu" also has narrative meaning, so the order can also be written as "Xu". However, when modern people study and test their own literary knowledge, they can't write Wang Xizhi's Preface to Lanting as Preface to Lanting.
In addition, nine words in Wang Xizhi's Preface to Lanting have been tampered with by later literature, such as changing from "self" to "fast" and from "swim" to "swim". But these words are not typos, but other words, because in the context, they are generally not enough to make readers misunderstand their intentions and do not hinder the correct understanding of the meaning.