Yeah those are not citations to the point, they are anecdotal at best.
I'm not a native speaker, my first language is french, and I used to make that mistake, which is why I brought it up. Get over yourself, there's no way to say "that's not a mistake they would make".
"This error is more disruptive for natives than non natives" doesn't mean what you think it means. Sure maybe it's not as frequent, it's not a basis to assume anything, or to say "I'm a native speaker".
"Could of" instead of "Could've""Could have" is not a typical mistake people make that have English as their second language.
Citation needed*
The fact that you think this needs a citation shows that you are a native speaker.
These might be no high quality sources, but it shows that it is something that non native speakers find weird:
Quora1
Quora2
Reddit
Blog entry about mistakes that native speakers make
Another similar blog
Oh, and here is a PhD thesis where you can see in chapter 5.2 "Error processing cost" that this type of error is more disrupting for non native than for native speakers.
Yeah those are not citations to the point, they are anecdotal at best.
I'm not a native speaker, my first language is french, and I used to make that mistake, which is why I brought it up. Get over yourself, there's no way to say "that's not a mistake they would make".
"This error is more disruptive for natives than non natives" doesn't mean what you think it means. Sure maybe it's not as frequent, it's not a basis to assume anything, or to say "I'm a native speaker".