Actually not correct. Salmonella can exist in a hen’s ovaries which is transferred into the egg before the shell is formed. I don’t know how common it is, but eggs do not have to be cracked in order to have salmonella. I think it’s referenced in the article above and at the CDC website.
The inside of an egg is clean and sterile, the only way salmonella would get inside is if the shell was cracked(which is why you're not supposed to eat cracked eggs). If there's salmonella on the recalled eggs it's likely because of contamination at the place where they're washed, eggs are washed before they're packaged, so the bleach or whatever they use to clean them obviously was not up to snuff.
“Eggs are not laid in a sterile environment. ... Through vertical transmission, bacteria are introduced from infected reproductive tissues to eggs prior to shell formation. This form of transmission is mostly associated with pathogenic bacteria, namely Salmonella.”