It doesn't say what proportion of the non MSM indicated who were found to be HIV positive were similarly diagnosed on their first check.

The point is, the fact that in this country HIV is related to sexual orientation is contingent, and relates to other factors than merely sexual orientation, as shown by the fact that in many countries where HIV is more common, it is heterosexuals who gave it and spread it.

HIV is primarily related to lifestyle choices, rather than to sexual orientation, which is only one element in a lifestyle.