It is not genetic. If it was then identical twins would always both be gay 100% of the time. They are not. If one is gay, there’s a 50% chance the other will be. The fact they are not 100% of the time, but a much lower 50% of the time, proves it is not merely genetic. Plus self testimony from lesbians and gays who admit making a conscious choice to be a homosexual.
Using the factual statements of Homosexuals and Lesbians in order to derail their political agenda is Hate Speech, and you will be prosecuted for it and if convicted you will be jailed for one thousand years.
Welcome to the Brave New World.
Or, the twins in question could have been bisexuals, and could have swung either ways, anyway, ultimately locking down on one choice.
As for the cloning part, I thought the article meant the members of the lesbian "couple" would each contribute an egg or a sperm. Even otherwise, like someone mentioned, egg and sperm from the same individual will still undergo pairing, where the final combination genetics cannot be predicted, as there is an apparent random re-combination that happens.