So is Rofocale the 1st of the 2 losses or is he not even counted?
Also idk, while Lucifer's plan is really questionnable, he's obviously acting in desperation to avoid 2 cataclysms that will lead to tremendous losses, and he's clearly favoring humans' fate since his experiment in his realm proves they're very likely to survive the ordeal compared to demons. Some demons should survive, Beelzebub (sadly) definitely will since he was an angel and is used to that power.
Satan's plan probably involves dooming everyone but demons
God's plan seems to doom both demons and humans and have a select few humans join heaven
The priest seems to want to both avoid responsibility but also can't resist the urge to save everyone, as he said he'll just stop Babayaga himself and probably would end up fighting God too, but that seems like a more ridiculous plan than Lucifer's (can it even be called a plan? He's more like "Nah, I'd win"), which is probably why Lucifer thinks they're similar.
One thing about it is that Lucifer might be underestimating the priest and also misunderstand what the priest can even do anyway. That's why Beelzebub decided to let the priest go and was looking forward to Lucifer's reaction, after noticing the priest already had the power of 2 archdemons (Leviathan and Belphegor) and has probably strayed too much from god already to even be able to help with Lucifer's plan.