Yes something like that, but there is also a lot more to it. The thing about ninjas is that when it comes to completing a mission, they use any tactic or weapon or technique that works, assassination or otherwise. Pure practicality, without limits.
Look, Reptaronice1, you just need to accept that ninjas were real, ninjas are real, they use short straight-ish swords with large square handguards and use shuriken, and that they're basically exactly as portrayed in cinema and in cartoons. That's a good starting point toward understanding the Art of Ninjutsu and the mindset of a Shinobi.