I'm not seeing anything in there about incubating, just about diseases and good practices to keep your flock healthy. Did you mean to send a different link?
Can you answer my other questions too? I really want to help you out and get you some ducklings

I know in the other thread you were saying that you think it's some kind of bacteria that's killing them, but I really don't think that's the case. Eggs are tough. I have khaki campbell eggs in lockdown right now that were washed, which removed the bloom entirely and left them completely susceptible to bacteria, and then refrigerated. I started with a dozen. I only lost two. Yours aren't washed (unless you are washing them, in that case you need to not do that) so there's no reason they should all be dying to a bacterial infection. If that was the case, you would get blood rings, not no development at all.