As a Lobsters user, I think you could have avoided those spam flags with a less click-baity title and opening line of the body. “MIT CSG Memo 137 was the first CS publication to use the term "object-oriented"” would have been a better title, since you posted after the result was discovered.
Also, Hillel Wayne already politely explained this to you! https://lobste.rs/s/ebztmj/now_we_know_which_cs_publication_...