After reading "Is everyone" singular or plural?", I would refrain from asking this question, but the husband of a colleague of mine (English professor, native speaker of British English) stated against it, so I am looking for further enlightenment.
He advocates some should be solely used to refer to plural forms. Thus,
some non-existent towns
is perfectly correct, but
some non-existent town
should be replaced by
a non-existent town
Is that true?