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Orochimaru learned how to his arms back way later. How would he know she can heal something tusnada her self doesn't even understandOrochimaru is one of the most knowledge characters in the series regarding jutsu, thats literally his thing. he also specializes in jutsu that involves your soul hopping bodies. why would he even remotely consider Tsunade viable if she couldn't heal his arms.
and yes Orochimaru has intimate knoweldge of how the reaper death seal works, which is why later on when theres nobody in the leaf, he is capable of reversing the effects by cutting open the demons stomach and freeing the hokage that were trapped in there.