If he's being serious, I would trust him. He hatches more chicks a year than most of us will see in a lifetime.
Although this one time he was wrong. 🤔
That SS pullet.
It could be a number of breeds. You'll need to wait until it feathers out for a more accurate breed ID. Is it bantam or LF? That may help narrow breeds down.
You will need to wait and post updated pics showing the comb and wattles, in 6-8 weeks for a gender ID.