You're right. Sorry, it's been a while since I reviewed the genetics behind sex-links and since none of the barred breeds ever really piqued my interest I am not the most knowlegeable about which is barred and which is not. To me, delawares look like barred columbian. However, a buckeye rooster over a delaware hen should still produce sex-link chicks. They would be red sex links though, not black sex links.
There is a very thorough
thread regarding the genetics behind sex-links in the sticky section of Breeds, Genetics, & Showing.