I assume there might be more men participating, and even so, half a minute can be flooded with a lot of people finishing at the same time. Like at my parkrun, the 29-33 minute finish mark has about half the participants (350-400 ppl) in it and then the rest is spread out between 16-28 mins and 34-55 minutes, typically.
I bet 1 hour 5 mins in the womens is amazing whereas in the mens it is the good side of average. Men typically have more muscle mass/power, larger stride etc.
So even though their times are not that far apart, I think it seems like Holly has absolutely pushed harder. Good for her.
And no, I couldn't manage what either of them are doing, my weekly parkrun has me looking like a beetroot for half an hour afterwards and I go home and scoff a sausage toastie, ha ha.
Fair play to them both for trying but I do hope Holly gets to celebrate without guilt.