It's not scientific, no matter how much you want it to be.
What you're left with is an opinion piece whose conclusion is drawn from a serious logical error on the part of the authors. They actually rejected the only hard data they presented.
It's no longer a question of whether or not homosexuality is wrong, or a civil right, or whatever.
The question now is, can you really trust a couple of guys who made such a glaring error in pursuit of their point?
It is your conscience and your commitment to solve your moral dilemmas through prayer, surrender to God and scriptural study that will settle all questions of how to behave, and which behaviors are beneficial to your soul.
If you do not care about your eternal soul, then this discussion is an entire waste of your time as well as mine.
Pundits of both the left and the right will make their points on any issue, but no one can utterly trust any words but those of God in the ear of a person with a contrite heart.
Good luck.
Basically what you are saying is that only those who have no viewpoint at all about homosexuality can write anything that qualifies as “scientific”.
Since such a person does not exist, there can be nothing ever written about homosexuality that is “scientific”.