My cynical take on this is that it's more of a open letter to the gay/lesbian/bissexual larpers that have appeared in the recent years than a statement destined to actual gays and lesbians.They don't really believe in any of this, because if it was the case, they would not defend policy that depends on the notion of sexuality as fixed to make sense, like in the case of refugee grants.

It makes no sense to consider sexual orientation as a criteria for accepting refugees if their sexual orientation can just change on a whim, as it would leave the door opened to scammers to abuse the system (something which already happens, but would be only get worse).