Yep, those 1940s CAPTAIN AMERICA COMICS were mostly horror stories with a pair of super-heroes thrown in. Pretty gruesome any way you look at them. In an early Red Skull story, the villains catches two imposters dressed as Cap and Bucky and immediately kills them. As their bodies hang in from of him, he laughs maniacally; and that's one of the less lurid tales.
I'd guess the Comics Code was not instituted because of this story (which would be a decade in the past and forgotten)but because of the hundreds of grisly, overdone horror comics imitating EC.
"STUPID COMICS" is a poorly-chosen name for the site, it's condescending and smug, but the content seems interesting.