Pretty sure that’s not true. When you switch your keyboard you will have a proper i character in another language unless your keymap is broken. How do you think Chinese, Russians or Greek type their characters?
The grandparent obviously meant “latin i”; none of the three languages you mention have any latin letters, but at least Russian and Greek have some lowercase and some more uppercase letters with the same glyph/shape as latin ones.
I frequently type German with a US layout with dead keys (so I can type "a to get ä). I also imagine that most Turkish developers type English on a Turkish layout, since Turkish contains all characters used by English.
