As a non-native Enlish speaker I'd like an n=1 'experience' to your n=1 'would say': the English is in my head first and then in writing. So at the time of writing there and their already sound alike and van be easily mixed up
This is true, but I (and you) learned to say and read/write these words at the same time, so we have an advantage over native English speakers in differentiating them.
At the same time the poster had a larger vocabulary than I have (which is true for native speakers generally, as I try to stay within simple English).
