Some projects developed exclusively or primarily by blind programmers do make odd indentation choices. A couple of my blind programmer friends prefer single-space indentation, or at least they did the last time I worked with them (using Python). NVDA uses tabs for indentation, which breaks with the Python convention of four spaces per indentation level. But blind programmers are perfectly capable of following the usual indentation conventions when working with sighted programmers.
Finally, I don't know of any blind programmers who like COBOL. I'm sure there are some, probably working at banks like their sighted counterparts; I just don't happen to know them.