Such a value is, indeed, a finding of the CDC report in question. The LifeSiteNews article which paraphrases it is (purposefully, I believe) misleading, and fails to invoke the precise quantities listed in the report's additional, specific inquiry pertaining to individuals who were having unprotected sex with non-positive partners. As of 2011, only 13% of HIV-positive Men-Who-Have-Sex-With-Men (MSM)¹ undertook such behavior.
The disparity is accountable to men whose partners are also HIV-positive. Now, even between two HIV+ individuals, there's upshot in using prophylactics; there are other STDs, of course, and even other strains of HIV. But, knowing that ~87% of HIV+ MSM are sticking to partners who also carry the condition, we can reasonably suspect that that many of them act with a sense of conscientiousness, even if they're not making the choice to use condoms, specifically. This conjecture starkly contrasts the LifeSiteNews article's tacit suggestion that a majority of HIV+ gay men are negligently barebacking whoever they please, consequences to their partners' health be damned.
¹ Interesting lexical aside: In the field of epidemiology, terms such as "gay" and "homosexual" are considered less preferable, because a lot of men-who-have-sex-with-men actually identify as straight. Go figure.