He's not looking for the plot (least going by his post if that's what you mean) he'd look at the bio which is pretty correct actually.
As for the story of the Black Spider Ninjas, it's a mess yeah.
their story itself is a mess hell the first thing you hear about them in game by Ayane is wrong. She says they're evil, but it wasn't that cut and dry and at the end of the Tairon incident they had given up their mission and was hoping Hayabusa could save the world in their stead.
They are the most interesting lore aspect of the NG games and are just a really cool enemy which is why I keep hoping for one of them to finally be playable in DOA.