This type of testing on brains is by now old news, despite the article's claim--was done at least once two or three decades ago, with reports in the popular media. Essentially the same conclusions. [Can google it.]
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At a get-to-know-gays event I once heard a couple of young guys claim to nongays that they had definitely made a conscious choice. Thereupon I couldn't resist explaining to the listeners that they had just heard a load of BS. The only choice involved--repeat, the ONLY choice involved--is whether or not to act upon one's orientation. The orientation itself is in no way, form, or fashion a choice. One may choose to accept the fact of his gayness or to deny it, but he is still gay and still never made a conscious decision. Whether homosexual orientation is established in the womb or soon after birth in very early months/years I wouldn't venture to speculate--but the person himself never makes a conscious choice. I knew that I was somehow attracted in a mysterious way only to men (and their "equipment") at a very young age, though with no notion of just what that attraction was or of its significance, long before I had any real concept of sexuality of any kind.
There's no explaining this, of course, to religion fanatics who insist, and probably have been brainwashed actually to believe, that it's a choice. That gives them divine permission to carry out their saintly [psychologically devastating!] duty to "cure" and "save" the poor ignorant sinners from their own willfully chosen satanic lusts. But to doubting or dubious nongays of supposedly goodwill and open mind, I always pose one simple question: "Okay, if I could choose to be gay, how easy would it be for you, as a straight person, to do the same?" Answers vary, but sadly always come down to one defensive denial: "Well, I couldn't do it, of course, but..."
But what...? Where now are goodwill, open mind--and good sense...?