I know you have to factor in the time when it was written, but when you consideer how candid Malcolm was in his autobiography, I would argue that Malcolm would have mentioned it. After all he did admit to being off powder, fucking white women, being a bugular, and driving white clients to their dates with hoes. Remember in the autobiogrpahy, he mentions a white trick that used to like to get wear a diaper and do some dumb shit with baby powder.
Malcolm didn't have to "sell slong", to get money, being that he was a consumate huslter. The nigga stay with money and he had no problems with generating income. Why would he need to resort to fagdom to support his habit? This is some weak ass attempt to tarnish the imagine of probably one of the greatest Americans of the 20th Century.