Yes in theory and fact oil will trap moisture. This is why leaving the razor open to air dry is a great way to ensure this doesn’t happen if you oil. The only protectant I use any more is if I store my razors for a long while. Mostly let them dry then put away while I use another razor. I live in a very high humidity area and no rust. Also I’ve used WD40 a lot. Can’t say it’s affected me. But like any razor I oiled it gets wiped down. I’m sure everyone wipes down their razor after oiling before use. Dry the razor completely and you’ll be good. We see this kind of rust from new guys because they just didn’t dry it