He won't need any prior knowledge on them to know he needs to not inhale poison gas, its common sense. By that logic everyone with no intel on Sasori loses because they won't know not to inhale poison gas shot at them.
Shino (whose intelligence, analytical and planning skills stood out for a guy with so little depth and panel time) couldn't help but to inhale some poison gas when he lacked the experience and full knowledge on Kankuro's capabilities.
What's common knowledge to us can catch a character by surprise in the narutoverse. No intel on Sasori or any puppet user is a great disadvantage for most foes, yes.
Remember, Akastuki has no intel on the Sandaime either, so the no intel works both ways. Konans Paper, Iron Sand, and Kakuzu's threads are all cut with 4FN. 1FN kills them all in one slash to be honest.
I'm aware of that, but there's a difference.
Unlike all these Akatsuki members, there's not much to learn about the 3rd Raikage. They'll soon find out he's nearly impossible to harm and that its very hard to defend against due to his spear and speed. He'll have to spend much more time figuring out the enemy, which btw can survive his most common offensive moves, all of them (except Deidara, but he can stand above with his clay and avoid CQC).
With a plan and their combined efforts (yes, Hell Stab can cut everything i mentioned above, but combined and used cleverly i don't think he can get rid of everything before inhaling some gas, which should be the Akatsuki's objective), i'm sure they could pull this off.