That there is no single genetic cause of same-sex sexual behavior is not at all the same as saying that 'born this way' is not true. Firstly, there may be multiple genes involved. Also, there is some evidence that the environment in the uterus plays a role. Also, that one study adds some evidence a certain way does not mean that we should forget everything that was found in the past. Including the fact that twins have a much higher chance to both be homosexual and the research of Simon LeVay.

I also am not sure we should draw much of a conclusion about what activists are saying. Activism seems to like aligning itself with what is most modern. That 'born this way' is now trending down says very little about either truth or what is going to happen in the future. Modern activism seems to be aligning itself with smaller and smaller minorities. Not that the people in said minorities don't also deserve to be treated fairly. People should take what people say about their sexual nature at face value instead of needing to know the precise label for something before being able to take it seriously. When we are talking about smaller and smaller minorities there will not be a label that is widely known for everyone.

To add some personal anecdata: my gay sexual nature seems to be about as fluid as rock.