I agree that the way it's been framed as the "right" to a biological child sets us down a worrying path. I do have a problem with commercial surrogacy, which I don't think is in any way batshit, because of the potential for the exploitation of economically disadvantaged women.
I'm reading "Backlash", by Susan Faludi at the moment, and I'm in the chapter about the move in America in the 80s towards granting rights and protections to foetuses. It is terrifying, and has a lot of parallels with this situation. These foetal protection laws led to horrific abuses against women, up to and including performing forced caesarian sections that killed the mothers in favour of trying to save the unborn child, prosecutions for miscarriages and numerous other horrors.
So what would happen if there was an unplanned pregnancy, which the woman wished to end, but the man invoked his "right" to fatherhood? Say it was in America with the foetal protection laws - you then have two sets of rights, the foetus' and the mans, in conflict with the woman's right to bodily autonomy. Game over. Forced pregnancy.
The WHO have completely overstepped the mark with this.