Yamatogokoro said:
Indeed but all humans make mistakes.
And what Toritoribe-san is saying is that it is easier for a native speaker who has read countless examples of cursive Japanese script throughout an entire lifetime to tell what is written by a native and what isn't.
It's not about comparing the "Western mind" and "Oriental mind". It's the simple and obvious fact that people who don't understand a language or a writing system are more likely to make not just
any mistakes, but repeated mistakes of a certain kind that make it clear to a native that the person who wrote it is unfamiliar with the language.
To reverse the analogy: Don't you think that you would be better qualified to judge whether a certain document in English was written by an English native or was a fake produced by someone with only a passing knowledge of the language compared to, say, a Japanese person who didn't really know English? That you would be better able to judge if the writer was using the typical sort of shorthand (or making the typical sort of sloppy mistake) that you might see from a native, as opposed to the sort of repeated awkwardness that makes the document come off as completely non-native?
You keep saying "misspelling" as if this is akin to a simple typo or slip-up, but it's more like writing a "G" backwards or upside-down ("⅁") or writing a "Q" so it looks like "Ø". There are some mistakes that natives just don't make, especially not over (and over and over) again.
Sorry if it sounds like I'm beating a dead horse, but I just thought it was worth making this point clear. People here aren't jumping to conclusions out of some eagerness to shoot you down or declare the flag a fake. To an inexperienced eye, all shorthand or mistakes might appear equal, but to someone who knows a language inside and out, the distinctions are more obvious.