Whether his gender is fluid , or how fluid it is, is irrelevant. The fact is he made a conscious effort to change and he did. The article claims that orientation cannot be willfully changed by anyone. But it can. My point is that, saying it cannot be changed is a weak argument against 377A. I've nothing against it but it just really looks like they are grasping at straws here rather than finding a legitimate reason for repeal.
I don't know if he's fallen in love with a guy but from what I can see he's been in a committed relationship with his partner for more than 2 years now and they are thinking of getting a flat together. I don't think it's just sex that's sustaining the relationship .
Anyway, apart from my friend's testimony, here are several published studies on the subject for your reference:
https://www.frc.org/sexualorientation
https://www.aarp.org/home-family/sex-intimacy/info-2017/can-sexual-preference-change-at-midlife.html
https://www.amazon.com/Can-Sexual-Orientation-Change-Memoir/dp/1520564511 https://www.google.com/amp/s/theconversation.com/amp/explainer-what-is-sexual-fluidity-33120 https://psych.utah.edu/_resources/documents/people/diamond/Sexual%2520Fluidity%2520in%2520Males%2520and%2520Females.pdf&ved=2ahUKEwihsbqt8PXlAhUZcCsKHfVrDiA4KBAWMAB6BAgDEAE&usg=AOvVaw2onbktSjQSsX1kLFe-vBSi
https://www.nytimes.com/2001/05/09/us/study-says-gays-can-shift-sexual-orientation.html
https://link.springer.com/article/10.1023%2FA%3A1025647527010 https://www.theatlantic.com/health/archive/2013/05/study-science-can-change-the-sexual-orientations-of-mice/276311/
https://www.google.com/amp/s/www.refinery29.com/amp/en-us/amandla-stenberg-gay-sexual-fluidity-orientation-change https://illinoisfamily.org/homosexuality/homosexuals-admit-sexual-orientation-can-and-does-change/
https://www.lifesitenews.com/news/major-study-changing-sexual-orientation-is-possible