I’m explicitly not making any claims about the affect of parenthood on performance in saying that in the absence of any evidence, it is as likely to make you better as it is worse. The burden of proof lies with the GP, who sees it as a risk.

I highlighted the claim that you did make and asked you to respond to that.

My point is that I didn’t make a claim, I refuted GP’s by saying that either outcome is equally likely as there’s no proven link between parenthood and performance. If GP wants to claim there’s a negative causal link, the burden of proof lies with them.

You didn't refute GP, you refuted a strawman. And snidely.