Sorry...I thought it was all about 4 doors. I saw the original list and I saw a lot of 4-door hardtops in there.
Even the factories still called their 4-door hardtops "sedans" (e.g., 1959 Chevrolet Impala Sport Sedan).
[Back in high school in the '70s, we differentiated the body type differences with the terms "hardtop" and "post", as in "2-door hardtop" and "2-door post".]