The author of the article is a PhD, not a medical doctor. His job is to write articles. The article was reviewed by the CEO of the company that published the online article. I don't have the time to look into the actual CDC dataset referred to in the article.
Is it wise to always be mindful of STD's and all other communicable diseases? Yes of course. If distribution of the article allows one person to make better choices then it's a good thing.
HIV is included in the overall aggregate numbers. No surprise this subset number would push the total cases even higher in a city where junkies crawling the streets of Philadelphia outnumber the cock roaches. Sharing needles, or picking them up from the gutter to reuse is a classic method to spread disease. Add the guys and girls having sex to support their effort and there's an exponential multiplier.
Philly is the poorest big city in America, social strata follows STD proliferation.